AITAH for not believing one of my theatre kids since she got “Sa’ed”?

Okay, I know the title sounds bad, but hear me out.

I (33F) am a theatre director. I love all of my kiddos so much especially this one kiddo (19F). We have a great bond. I’ll admit I am kind of strict to her because I have to set out personal boundaries. She keeps on texting me nonstop on Facebook (I’m friends with almost every kiddo I work with on Facebook because we have a Facebook group page to keep in touch with show updates) and I firmly told her to stop. She was teared eyed but agreed. She even apologized. She admitted to me that she was also autistic. As much as I have sympathy for her, I’m not her counselor.

Fast forward to now, my boyfriend (32M) and I have been together for about 2 years. As I was gonna start my practice, (19F) comes to me in hysterics and tells me that my boyfriend Sa’ed her and she has proof. If she hasn’t been bothering me on Facebook messenger so much before, I would’ve believed her. I told her that I’m not her counselor, and there’s nothing I can do about her supposed SA. I told her to please go home for today as I can’t deal with her BS and was so closed into kicking her out. Her parents saw what had happened and told me I didn’t have to be so cold to her. My best friend (28F) even agrees with her parents.

AITA for not believing her SA story? I just wanna keep my boundaries to respect myself.