No, I think Mary Louise was referring to when her husband died, and she didn't think she could go on, but did for Perry's sake. Just like Celeste will be able to carry on for the sake of her children.
She put a crystal and two other small objects onto Bonnie's dresser. I don't think that indicates she practices voodoo or anything. I think she's just a New-Ager who also has visions/premonitions. It appears that Bonnie has inherited her "gift" but rejects it and doesn't want anything to do with it.
For me it's the eyes. Once an actress has her eyes done they never look the same. I understand the motivation in Hollywood, and assume these actresses are going to the top professionals in their field. But two women can go to the same doctor and have the exact same procedure done, and one will come out looking great, and the other will look horrible. It just depends on the individual's face. I don't think I'd take the risk. Sometimes you have to accept the fact that a particular career choice has a shelf life. Athletes do.