My Therapist Told Me She Took My Insurance And After 15 Sessions Told Me I Was Not Covered But Could Pay Her Back With Trades Because I'm A New Nail Tech. There's No Documentation Or Bills I Recieved She Told Me She Would Keep Track Of Everything And I Just Can't Do It Anymore, Please Help

I was in crisis when I went to see her She told me she took my insurance and then after seeing her once a week for months (15 sessions) I got a notification from my insurance that they denied her appointments In our next session she then informed me that I wasn't covered at all and could pay her back with trades I'm a newly licensed nail tech I was freaking out thinking "yay I don't owe thousands of dollars of course I'll do anything!" She told me she would take care of everything: how many I owed her and it's okay to keep seeing her because we can just trade since she was retiring anyway I did 8 "trades" with her and just can't anymore I haven't heard from her since July and she just reached out to saying "Good morning. I hope you are well. Wondering if you want to schedule or work out a different payment plan?" I didn't respond and today she requested a nail appointment and wanted me to confirm I feel sooooo taken advantage of and now that I am mentally stable I am so upset I have no documents from her billing or scheduling. (She did it on a planner) And I have no idea what/if she did document anything after my insurance denied a few sessions I haven't received a bill but I am petrified I cannot have her as a client I think it's bad for my mental health as she literally knows everything about me What can I do??

Edit 1: Thank you for everyone's advice! First, I'll be calling my insurance and finding out how many sessions she actually tried to bill. As well as, contacting the state board and I won't be responding to her messages! Will update tomorrow with more info, blessings to you kind people of reddit