My daughter getting hurt ?

So today I noticed my daughter had a scratch on her back with some redness I asked her what happened right here ? She said “it was Morgan”? I asked Morgan? She said “yes she was fighting with me” I said okay? as I was brushing her hair I also noticed her hair was a little chopped off my daughter has long hair so when I was brushing all of it I noticed a small part was being left out I told her “did you cut you’re hair “? “What happened?” She said it was Morgan. I continued to ask her in different ways only to see if I would get a different answer she said the same thing. She’s my first daughter who’s in kindergarten and as a mom I am mad because where are the adults ? Where’s the staff ? Where are the teachers ? What-a hell is going on !!! And I will be sending her teacher a message and will be talking to the girls mother as well. Idk what’s happening!!!!