I feel so bad for your foster DD but I also think you need to be aware that if there is not a companion bathroom available that a mom could be in the woman's room with a disabled tween, teen or man for that matter, and yes they may bring them in the stall but they do need to get the person from point A to point B. And the mom may have no other choice if another male is not traveling with them or available at the time. If she gets that traumatized you may want to prepare yourself and her.
I have seen these males in the restroom and it is hard on the parents, but what are they suppose to do???

There was a post on the other thread about the Cape May Cafe, older woman brought in her disabled son who appeared to be in his 30s. She apologized but had no choice, took him right in the stall, had him wash his hands and then leave. And she got grief from two ladies in there. I have eaten and stayed at the Beach Club and as far as I am aware there is no companion bathroom but maybe I am just not aware of one, nor was she apparantly.