I removed her toenails with a pair of pliers
That is disturbing. Why would you do that?
I'm sorry. I can't help it. I loved doing it.
Cutting toenails is one thing, but if you're fully removing someone's toenail you're causing them a great deal of pain. If you remove someone's toenail, their toe is likely to become infected and they may need further medical treatment. Only remove toenails if you're trained medical professional.
You can't guess what this girl did to me.
Even if someone has hurt you in the past, that doesn't give you license to hurt them in return. If this girl did something bad to you, you should either report her to the authorities, or you should just do your best to avoid interacting with her. Pulling out someone's toenails is a form of torture and is cruel.