Runny nose?

Ever since my kiddo started preschool she has had a runny nose. At first she had caught a virus, but we've all been over that for a week and a half now. I thought it was allergies, but Zyrtec seems to do next to nothing.

Thoughts? I feel bad because every day I pick her up and her nose is running. I don't think she knows where tissues are at school. 🤦‍♀️