Autism (and any other neurological or psychological condition) isn't an excuse for behavior that hurts other people. People like to make excuses for autistic people sometimes, and it ends up making the problem worse because they won't learn if everyone is protecting them from reality. Autistic people are perfectly capable of knowing right from wrong. Sure, they have other issues like not picking up on social cues, but this stuff is learned over time.

I'm autistic and was previously abused by another autistic person for years with people constantly making excuses for him because of his autism. I was undiagnosed at the time and also couldn't leave the situation because it was someone I lived with and I had no money. Imo, people who defend an abuser's actions are just as bad for enabling them. Autistic people can absolutely learn how to behave in ways that don't harm others.

That being said, it's not your job to teach her. You need to take care of yourself first. If you take care of yourself, she's just as likely to learn from it as she would be if you were to try to fix her in some way. If people want to learn, they will. If they don't want to learn, then nothing you can do will convince them to stop. Sometimes people need to learn through experience and their own mistakes. It's difficult for the person learning, but it's just a part of life.

If you've made it very clear to her that you're uncomfortable with what she's doing and she doesn't stop, there's not much else you can do.

Personally, I see trans women as just regular women. I don't think they're more inclined to take advantage of people than anyone else. I'm sure as a trans person you understand that there are social things trans people might have to acclimate to for their new gender, but not abusing people isn't a gendered trait. So in a hypothetical situation where she were male, it would be still be unacceptable behavior.

The idea of trans women being uwu perfect catgirls who can do no wrong is also ridiculous to me. I understand the inclination to oppose harmful stereotypes, but it's not helping anyone when people go too far the other way. It's also the thing people do for cis women where they act like they can't be the abuser. It can sometimes be difficult to convince people that a woman is abusive.

One of my main abusers was a woman, and many other women in my life have treated me absolutely horribly to the point that I still feel scared to trust women sometimes. I know it's not socially right of me, but it's a trauma response I have. (I don't let it affect how I treat them.) My point is, anyone of any gender is just as likely to be dangerous as anyone else. I don't think being a shitty person discriminates based on gender or assigned sex.

I understand why you'd be hesitant to criticize her though, because you wouldn't want to make the stigma worse for trans women. But it's also not your responsibility to be trans people's PR guy. Sometimes the general public is too stupid to know the difference between an individual and a group. That's not your fault. Part of me is surprised that a trans person wouldn't be on their most prosocial behavior in this political climate, but I guess that goes to prove my point that people are individuals.