My daughter has a bully

Hi all! Just needed to vent a little! A few weeks ago my 12 year old daughter was sent some very nasty texts while at school from another student. There was a lot of cursing and comments of no one likes you, you’re pathetic, etc. My daughter doesn’t even interact with this girl but the running theory is my daughter was an easy target because she is nice and quiet and because my daughter wore dyed hair clips similar to the bully. The text messages ended with a threat of physical violence if she even looked the girl’s way. My daughter showed it to my older niece first who contacted a mutual teacher before even telling me about it! I scheduled a conference with the teacher the next day thinking she could be trusted to help after she told my niece the texts were sent during school time. The teacher said she informed the principal but there may not be anything they can do since the texts were sent from the bully’s private phone and wait for the school to follow up with us. Almost a month later and nothing from the school. The girl had apologized in texts but then a few days later sent more nasty ones. My daughter never responded back to the texts. Today, I was waiting in my car, not blocking a carpool lane or anything lol, waiting for my daughter to get out of an afterschool program. As my daughter was walking to the car, the girl came up behind her and hit at her back with a jacket. I immediately got out, told my daughter to get in the car, and then walked over and told the girl I saw what just happened and I also saw the texts that were sent. I said to please leave my daughter alone or we were going to the police. The bully started crying and then as I went to walk away the same teacher came out who knew about the bullying but didn’t witness the beginning of when the bully swung at my daughter started yelling at me for talking to the girl. I wasn’t even allowed to tell her I saw the girl swing at my daughter’s back. Then the principal got involved and started to chastise me until I mentioned the girl swung at my daughter then said she could understand why I was upset but I better be sorry for saying anything to the girl. Now my daughter is scared to death about retaliation and that the school might try to come after me. She cried herself to sleep. My husband said since I wasn’t nasty or threatening I did the right thing since the school not doing anything has caused the bully to get bolder. We then filed police reports and contacted the superintendent and we will see if anything happens. I feel like a horrible Mom now for possibly making things worse for my daughter with the bully and her friends, but I would hope if any adult saw another child physically swing out at another they would at least try to protect my child and say something too since the school has ignored us ugh!