My daughter's hair

My daughter was very long thick black hair. It comes down past her hips. Her choice not mine. She keeps it washed brushed and styled. Most days she has it in a French braid. Yesterday I got a email from her English teacher asking me to cut her hair. She says it's much to long from a child her age, says a braid is not age appropriate and her hair is distracting to the other girls in her class.

I don't even know how to respond to this email. Wtf