On the surface she wants huge payday so she can start a public service firm. She explained it in that last scene, she wants to provide the type of legal rep to people who otherwise can’t afford it.
But really she’s addicted to the thrill of scamming now. We’ve been watching her downfall in the background while focusing on the birth of Saul. I think they did a good job setting it up, remember she wanted to do that scam in Mesa verde before pulling the plug. And when jimmy went ahead with it she upped their commitment.
She tried to call her boss’s bluff when he could tell something was off, she used Jimmy’s trick on her client earlier this season to get him to plead out, etc. They’ve been building up her downfall too. Learning the truth about jimmy and te cartel was her breaking point.
Breaking point in what way?