@alisonhansford Get out your school policy. It should be a booklet or a PDF that was given to you when your child was enrolled. Find the policy on biting, behavioral issues, and hitting. Document every time and every mark. Match them with the documents the school gives you. The documents' dates and descriptions should be similar/the same.
I had a kid like this in my class, but administration sucked and wouldn't get my students (yes multiple) the help they deserved and needed. They kept trying to place the blame on me infront of parents and on the parents to me in private. It was a toxic work environment and the children were put in the middle, obviously undeservingly.
Plans shmans.
It took a parent bringing a full frontal assault with notes and medical reports (that they hid from us and that it proved what my ASQs said) in order for my boss to take the issue seriously. Boss didn't realize I also brought in copies of multiple reports I sent to her and the parents as well. It ended up with my boss on the defensive and the student moved where they could possibly thrive.
This may not be a teacher thing as we don't have the power to move students attendance, but be assured, you will need documentation to show the administration what is needed. I would suggest teaching your child some self defense strategies in the mean time (paying attention to surroundings, what to yell to get attention, physically dodging or getting up and leaving). I know a bunch of teachers that are pro self defense in young pre school children and will use it as a natural consequence for the other child. Im so sorry, I really really REALLY wish I could do more. you have my support!