This is probably controversial, but imma say it anyway. Ella is both a victim of Alice and a spoilt brat. Yes you can be both. She has been exploited, manipulated and abused but also told how special she is (as Mommy's mini-me and Golden Child) and she's better than her father and B and other people who deserve to be abused, like black people working for the TSA, or who park IN A COMPACT SPACE.
That is why I have mixed feelings about her. She can say no to mAlice sometimes, like when she said she didn't want to be on Insta for a while but she didn't say no to the abusive behaviour, like stealing, threatening, hacking and perjuring herself. She also knows that IG has always been good to her, both before and after the split and she still behaved that way. 14 yos can and do say no to being used in this way, but she didn't. So yeah, I have mixed feelings while acknowledging that the spoilt behaviour is a sign of mAlice's tit parenting too.
As for dealing with narcs, I have had a LOT of experience with them and I find material on the 'net very useful as there is power in knowing just what you are dealing with. That didn't exist when I was growing up and was just baffled by behaviour I didn't understand. I do now and therefore I know - it's not me, it's them and mentally tick off all the red flags. As for Ella not reading documents easily available online or dismissing them if she did - it's important that she has a counter-narrative to the BS she hears from AFE. That's one of the main points of the therapy that IG pays $4,200 a month for, to help her to see a different perspective. The therapist will gently question her when she says "It [Bianca] ruined my happy home" for example. That's how the brainwashing might be undone, when the cracks get into the BS narrative she's been fed.
Each situation is different - as there are both environmental and personal variables at play here and I'm only talking about her situation specifically, not about what it was like for others, even if there are some similarities. Ella is getting expensive counselling which lots of kids don't get and has a supportive dad which many kids don't get either. I really hope she doesn't become Alice 2.0 and I'm not writing her off or saying she can't change. I hope she can.