If she is honest in her book about what she did that's caused Mariah to cut ties with her completely and actually take some ownership, maybe they can make amends. But if the book ends up just being an expose on Mariah, which publishers will probably push for it to be then that'll never happen.
It doesn't sound like the book is going to be about Mariah and legally, I don't think Alison is allowed to say anything, anyway. Whatever agreement they signed way back when muzzled her. I wouldn't expect any expose on Mariah, just general stuff, like Tommy Mottola's book.
I hope the sobriety sticks. And stay away from Morgan. He doesn't give a rats ass about her and it seems like she's wise to that too. Basically said that he was using her to try to smear Mariah.