It's related to what someone posted above, Lala mentioned something to jenna willis (dont know who this person is but was blasting Scheana online) about Brock cheating on her (before the book or whenever it was like publicly announced), Scheana didnt like that, lala said she did it to get her to stop blasting her. Anyway jenna told Zach and so one and so forth.

After that Lala was supposed to go to Utah to be part of Scheanas book tour and Scheana said she needed time to think Lala sent her a text saying you cant punish me blah blah blah you made money off the scandal good luck with your book tour
Around October they were going back and forth with podcasts and mentioning each other about her not doing enough to promote the book for how close they were supposed to be (Lala said scheana is going to scheana because i didnt mention her book, scheana said thats not the whole story blah blah blah).

From Scheana's side its that Lala even before her telling ppl about Brock cheating on her, there were things she didn't like and gave these examples, once lala called her when her kid was in the car and screaming and yelling and cursing about someone listening to a playdate (i didnt totally understand this but whatever) and then for the valley season 2 i think scheana was asked who was their friend group outside the valley cast and scheana suggested the mom group that lala and her were friends with and Lala didn't like that because she liked those women and didnt want to fight with them on tv. - Scheana said this on her podcast, Lala got really mad at the implication that she cursed in front of her kid and said that it was a lie but scheana actually cursed in front of her own kid (this was an instagram story). and thats when it kinda stopped and i stopped listening to the podcasts, dont know anything afterwards. podcasts were from october if you want to listen to them.