Paula,
I'm really sorry this incident happened to your friend. I think it's best she stays with you, and stays in a trans-friendly area. I agree that Texas is a horrible state to be trans in. The worst part is in some of these transphobic places, even if she did fight, whether she wins or loses, she would probably go to jail and her attackers get away with it. I have heard stories like this before where the trans person goes to jail for standing up for herself.
You may want to contact transgenderlawcenter.org. I'm not sure if they only serve California or if they serve the entire country. But it's worth a try.
As for the condo management invoking the Christian argument, they are anything but Christian to say that. Shame on them. I think she'll be much happier in the gayborhood than that transphobic Christian wannabe environment.
I still waiver on transphobia being caused by Christianity or is it just part of our animal instincts. Maybe Christian doctrine is based on animal instincts too.
I think some people might act like this out of peer pressure. It was one of the girls who clocked her thought, so women are not above reproach either. Both sexes can be horrible when it comes to transphobia.
P.S. She has every right to dress the way she does. I hope she can dress as herself in a safer environment.