If that trans girl gets super weirdly apologetic, like is borderline apologizing for breathing or is apologizing for things that are basically nothing/happened forever ago, whatever you do, do not leave her alone. Chances are it's one of two things, and neither of them are good; she's either bordering on a breakdown and thinks basically everything she does is wrong, or is past that point and desperately wants to make sure no one's angry at her before she hurts herself/takes her own life. You might think it's weird, you might get tired of it and want to push her away, but for the love of god do not do that. Her apologizing every 0.5 seconds is because she's been taught not to value her own emotions, but they're overpowering her and she doesn't know what to do other than apologize like her life depends on it. Her life might not depend on it, but it very well could depend on how you respond to her heart's most desperate cries for help