R.
Call the district office and ask how to go about filing a complaint. Ask them if you can move her to another school district until the issue is resolved. They will probably say you can't move her because they HATE seeing their tax dollars walk out the door. SO then call another district and ask them the same question. If they would mind taking her until the issue is resolved. They will probably agree to because that means they get the tax dollars attached to your child for their district.
I would NOT let this go. Parent apathy is a major problem with the public schools these days. Public schools like leaving parents in the dark when it comes to safty and learning issues.
But be aware this could get you "black listed" as a trouble maker in that particular school.
I used to volunteer for the public school system and was labeled as a "dissenter" because I spoke up about several things I found questionable.
RPocai