Thing is, she had SO many opportunities to not be terrible. Seriously. Staff members on shows get SO MUCH leeway from fans, because they’re fans! They don’t want to say anything, even if it’s true, because they don’t want to harm the series they like. If you get to a point where fans are outright pushing for your removal, you probably went “too far” a long time ago. This evokes a lot of 2019’s Vic Mignogna shenanigans, where internally the issues with the actor had been known for YEARS, but because they were someone people liked and made the company money, they didn’t get removed until WAY too late, leading to backlash from that sect of online people that just don’t care who gets hurt* as long as they get their TV. If either the company had dealt with the bad behavior early, or the person involved had simply stopped, there almost never would have been a problem (I say almost because in the case of Mignogna you don’t just take back years of sexual harassment).
The simple fact is, companies will only deal with bad behavior once they fear NOT doing so will be a financial threat. The fact that this went down the way it did shows both that Carano did NOT feel threatened by Lucasfilm’s actions AND that Lucasfilm themselves waited the absolute longest they could to take her off the project, which basically ensures the crazy backlash from entitled internet weirdos.
* (I should mention that in both cases, this is a charitable assumption. I actually think defenders of both Carano and Vic are angry because they agree with the actions of the actors who got removed, but I guess there could be some who don’t, and just didn’t want things to change)
TL;DR: Carano dug her own grave, but also Disney should have acted earlier if they didn’t want backlash from the angry online brigade.