hi everyone need help?

Basically there is a girl at school that I'm ignoring yeah, my friend just started ignoring her so there is both of us ignoring her now, basically I'm worried that the girl will think I told my friend to ignore her and I didn't but she will ask em and ill just say no yeah , but then she will say ur lying and stuff and I cant do anything then. Ik she doesn't have proof but still she will go to the teacher and say. This girl ( me ) is telling people to ignore her , IK SHE DOESN'T HAVE PROOF, but she will still say , dis u tell her to ignore ke and ill say no ask her if u wnt and she will say ur lying she always does