Regarding the name Cherry, I got the impression that it was from the memory Camille had when Adora confronted her in the kitchen and said she was going to the store. She shamed her because of her scars when she asked for cream. She then looked at Camille and said, “I’m glad to see you eating, you haven’t eaten a thing since you got here” and held the stare a very long time watching Camille stand eating a cherry pie (without a plate) left over from Calhoun Day (?) As she held her stare, Camille flashed to the memory of jumping in that same doorway in her cheerleading uniform to show it off and Miriam exclaiming how great she looked, saying, “Mama, doesn’t she look like you could just take a bit out of her?” Adora never looked up from the sink and said, “Yes, like a nice big ROUND cherry” to young short haired Camille in her red uniform and her face fell. Camille, in present time, realized adoring was staring so long and said, “What?” and Adora gave her a disappointed look and Camille put the fork down. It gave me the impression that Adora always told her or made her feel not pretty enough or thin enough or loveable enough and that she shouldn’t eat if she wants to be pretty and popular, as Ashley said, “That’s all that matters” (contrasted with what we see the popular kids in Amma’s group do and how they behaved when Camille was young too). Camille put down the fork to stop eating the pie and went over and gave a hug to the housekeeper to thank her for loving her unconditionally and suggesting she eat some left over pie, contrasted with her cold mother who never missed an opportunity to shame her by saying she never eats while simultaneously implying, “should you really be eating that?” Further, as Camille’s hair grew long in to her teens, I got the feeling that she had the nickname Cherry for her red hair. Yet like everything else in Wind Gap, everything means more than it appears on the surface. The boys may have called her Cherry because they know they took part in taking her virginity in the woods. That last sentence is only a guess and an inference because Cherry is one of the words carved on her upper leg. So it is a painful word that she uses to punish herself. The hurtful words of others carved in to her skin because they are who she believed she was at a time.
I agree that that it seems weird that Camille would be pulled in to hanging out with Amma. However, we have seen that 1) Camille is very curious about finding out more of what is going on with the teens even if she doesn’t think this is a smart way to do it;and 2) Amma is clearly sociopathically level manipulative. She seems to know what people want and need and crave and enjoys tempting them and playing on their weaknesses to get what she wants. Camille is still mourning (or never properly did mourn) her younger sister and she seems to subconsciously want to protect Amma or please or pacify her and she responds to the “you’re my sister and I want to know you and spend time with you!” She also doesn’t like seeing Amma drunk or high and feels need to stay nearby as if that could help somehow. Amma knows this and plays on these strings. She also knows her sister LIVES in pain and therefore offered her an oxy (Percocet) after that horrendous night with the bitches at Beaches and mind it sound not a big deal and so enticing and got the whole car to pressure her to take it. Then purposely gave her ecstasy. I think Amma is fascinated by Camille and does want to know her as her darkness fascinated her and she is tired of playing at manipulating everyone else in Wind Gap and this is a new interesting person. Amma craves a sister, yet not in the way Camille does. Amma says hurtful things and then is sweetly contrite the next day and throws her arms around Camille. Camille is a new fascinating factor in town (and she got out of the town) so Amma is fascinated by her in a sociopathic way of wanting to get close to learn what lies beneath, so she can understand her, and likely manipulate her (that seems how Amma operates— she doesn’t seem to have true empathy or any true remorse for her actions).
I also get the feeling that Adora had something to do with Camille’s sister’s death. Her cause of death is left unexplained except that she was “always sickly” and we saw her in the spinning flashback with Camille getting more and more weak and skeletal like. It makes me think there is some kind of Munchausen by proxy situation in which Adora hurt one of her daughters, by keeping her ill, due to the attention and sympathy it brought her. She is forever a fragile flower and a saint because she had a daughter who died, who she and Camille never had a conversation about. She was cruel and hurt Camille in different ways. I suspect Adora telling Alan the cruel things her mother did to her are things that she did to Camille, which was blowing Camille’s mind during that conversation with Alan. Adora finds a way to blame everyone else for her pains and made Camille her target of her pain for losing her daughter and Camille took it out on her body. Amma is a similar sociopath and thus, knows, how to play to her mother’s needs and she does whatever she has to in order to get approval. Adora is now lost in her own world fugued by alcohol and not that close in raising Amma, so that if Amma satisfies a few things it satisfies her mothers needs and she is left alone. Something Camille was NEVER able to do.
ETA: I don’t know anything so this is pure speculation, yet it seems like Amma is a true sociopath without feelings beyond using her charm to get what she wants. It seems as though she is possibly evil and cruel enough to be the killer of the girls and may also be a factor in why she wants to get closer to her sister who is investigating the murders. Amma is inserting herself a bit and seems to love playing with fire to see how much she can fool people and get away with things— especially to those closest to her. It is just a strange feeling I get when I see Amma smile when she manipulates Camille in to doing what she wants— especially something she shouldn’t do, like taking drugs and partying together. A micro expression of satisfaction of successfully drawing her in and again having control over another person’s behavior.