My daughter is mad at me

I made a mistake. I was the one responsible for bringing my son and his friends lunch for soccer last Friday. All my kids are teenagers. My daughter had to change underwear at school because she got her period. She put her bloody underwear in a paper bag. I guess for some reason she put it on the kitchen table. I think because she was taking things out of her backpack and forgot. I mistook it for the bags I packed for their lunch and when she found out she was angry. I had already sent them with my son and at school one of his friends gave it back to her. She was upset because it was awkward and he was embarrassed and told her they're clean because his mom washed him and he swears he didn't touch them so I guess he told his mom. She's 14 and hormonal and mad at me. I feel bad but I've been trying to tell her he didn't make it a big deal so don't make it a big deal