I agree with Wise.
Don't participate with abuse.
First, she will qualify for help from the State Dept of Rehabilitation. They will pay for her to complete any training for which she is suited. She may require the help of an advocate but that is available too. They will also help her get volunteer work. They will give her a stipend. They will find the position. They will coordinate and communicate with the agency. They will try to impart to her the skills she needs to do this. There is no need for you to fulfill this role.
I would (try to) back way off with her. She is becoming more aggressive, entitled and demanding. We cannot save our mentally ill adult children. If they respond to support and love and care with inappropriate, aggressive behaviors, that is an answer that must be taken seriously.
Nomad. We are in similar situations. It's time to see the writing on the wall. I would try to back off. That is what I will be doing with my son. If these are the lives they are choosing to create, this is what is reality. To not accept reality makes us exceedingly vulnerable. And we suffer.
I for one will be starting again at Al Anon.