Advice on how to get my mom to tell me something she's not?

Yes, sorry, there’s a lot to read…

So after a therapy session I’m just putting it out there that I’m having a few issues right now… that my therapist had my mom sit in on, my mom wanted to keep me home from dance that night, because she wasn’t sure I was “strong enough” to go… and then she kept me home from school the next day… and then dance that afternoon too. Only, she asked me if she wanted me to have her talk to my dance teachers so that they’d know that me staying home wasn’t “about them”.
That kinda freaked me out, but I didn’t want them thinking I was staying home because of something they did… so I said yeah, she could go. And she wasn’t quite clear on what she was going to say to them, just that it “wasn’t about them…” But she usually knows the right things to say and do, so I forced myself to trust her and agreed.
She was gone for about an hour and a half, and when she got back she told me that they had been worried about me, not sure what to do, and were so glad to get to talk to someone, that they got to vent some stuff… she said she “mostly just listened” and that they talked in “general terms to not violate my privacy” but that she “didn’t remember what they said”. And that’s all she told me, literally, after being gone so long saying who knows what…
That’s all she will tell me. And I feel like she’s lying to me, hiding something from me.—Do you think she is? I’m way uncomfortable around my dance teachers now, and I hate that. I feel like they’re either just putting up with me now, or pitying me and being easier on me because they feel like they have to.
I’m way uncomfortable around her, too, because I’m scared that I’ll say something that’ll make her think she has to butt into my life again (I’m 17… it feels a little invasive…)

I need a way to talk to her so that I can hear what she told them about me, what they think is “wrong” with me now or whatever, because I just feel weird around them now. Could you help me find the words?