That scene where Molly is in the Ethiopian restaurant waiting for her food, sees Issa getting out of the car and says to herself, "Here we go," I read it differently than many of you do.
I thought she was waiting for Issa to come in because she saw Issa was coming in. Not to be petty and wait for Issa to grovel. I thought the "here we go" was a recognition of the fact that this encounter - whatever it may be - was not going to be easy. Not only did they have Molly's blowup between them, but it had been months since they had had anything like a real conversation without simmering resentments and unspoken feelings beneath it.
I'm not really sure what Molly should have done instead of wait for Issa to come in. When Molly looked up the first time, Issa was just getting out of the car and not looking at her. She couldn't wave or beckon to her at that point. Then Molly looked down at her phone and by the time she looked back up, Issa was leaving. It was clear that Issa was deliberately avoiding her.
Of course, Molly should have called Issa. Then and before then. The one time Molly started to offer an olive branch - at the beginning of Issa's block party - she took so long to get to her words that Issa got pulled away.
Of course, Molly's later rude ass comment about Issa running from her like a job was out of hurt. Molly has been shown to express hurt as anger. Every time. Look how angry she was at her father and how long it took her to offer him an olive branch. And she still never said the words.
I guess all I'm trying to say is I didn't read Molly's reaction in the restaurant as petty. Just bad timing and her already established reluctance to make the first move. I'm just glad she is finally remembering (with Andrew's gentle, subtle support) that she needs help and is trying to get it.