But for my sanity I’ll assume the second option. Just know that a lot of children in therapy (especially teenagers) just Snoopy worrying is a waste of time it doesn’t change anything it just messes with your mind and steals your happiness shirt to vent sometimes. I know I’VE said some really harsh stuff about my mom in therapy that I didn’t really mean, I just didn’t know how to express myself correctly, and my therapist helped me with that. Telling your daughter directly that you overheard these things might make her scared and close up more, even around her therapist which is the person she should be the most honest with. If it was a true accident maybe tell her to lower her voice during therapy sessions? Or even go outside when your daughter is doing these video calls. Honesty is important but also remember that if she is scared of being honest with her therapist (say, for fear of you overhearing), its a lot less likely for the therapist to be able to help.