I think part of Priscilla's big problem is that she has no idea who she is outside of Asa and the kids. they were so young when they got married, barely knew each other, and only got married because she was pregnant. Isaiah was born and then they moved around according to his work, leaving her isolated in new places with only the baby and Asa to connect to, and they obviously went through some difficult years.
then when Abbie was born she probably thought that would fix everything, except then the diagnosis came along. they all could have benefited from some counseling at that time, especially her, to accept the diagnosis and their new reality and learn how to manage expectations. instead it just became a string of just holding on and getting by. now that they've reached a level of comfort they never had before, she thinks she's gained some independence with her "business" - but of course, it's just a MLM that has pulled her in and it's all built on a house of cards. not to mention that her success with that is also still tied to being this perfect advocate mother. she's trying to be youthful and relevant, things she probably hasn't felt in so many years, and this taste of notoriety and wealth is enough to validate everything for her after so many years of struggling.
I want to be sympathetic to her, because she's obviously gone through a lot with this marriage and with Abbie. but there are other ways to show grace under pressure, and desperately clinging to tik tok and exploiting her daughter for her MLM are not the way to do that.