Basically, yes. Talk to the principal, and gauge whether he/she is paying attention to you, and also whether this is news or not. (Sometimes, frequently, it isn't.)

Also, if you're now a parent, talk to other parents about this. Both from a support perspective, but also to let them know what's going on.

I do think the school board might be called for further down the line, if you find out she hasn't changed an iota, and that the school is still protecting her.