12 year old left school and got a sleeve tattoo in some guys garage. So mad! What should I do

I have guardianship of my sisters daughter who is 12 and this dumb ass got a “scratcher” sleeve in some guys home with her besties and skipped school. Yesterday I dropped her off at school and I guess by first period her group just walked off campus and the guard let them, no passes for nothing. I check online and noticed it showed she was absent yesterday. Call the school and was told they got a call but knew it wasn’t from me. So they just went eh oh well ya let’s not notify me of this. I go view her page on TikTok cause dumb ass forgot we follow each other and she did a vlog of her day. Literally showing leaving school, in some guys house, mentioning that these dudes are 20, cut to her getting a tattoo and she used a text box to write all this for $100 and showing the finished results which is a full sleeve then they were at a park and filmed themselves throwing rocks in the air. Ok so now I’m thinking where this girl get the 100? I gave her $25 to put on her school lunch account and it was all there. Sis was gonna make sure she gets her food for the next. 2 weeks for sure. Debit card had no transactions for the past month. I’m worried since these guys were so much older that they “cut her a deal”. She’s still at school and not sure how to address this. Do I let it slide for today until I can talk to the school or go off on her tonight? From the TikTok her entire arm doesn’t look good like the lines are terrible and have no shading. I’m worried the needle wasn’t clean and I’m so mad that the school knew it wasn’t me who called but yet didn’t notify me. How would you handle this???

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