NIKON DSLR? I MEAN THE LENS?

OMG Please Help ME.

I brought my Nikon DSLR at school and then one of my classmate borrowed it so i let her. But she accidentally destroy the lens and i just can't scold her. That was a gift from my father and I was too scared because that lens is too expensive. I'm scared because my father might scold me for being negligent. Help me please:'( he will be back from work, i can't tell him. I want a serious answer please. I already told mom about it but she said i should tell dad about it but too scared?

Tell him it's just a mistake