How can I block a email from logging into facebook?

[Sick with it!]

My sister always uses my computer instead of hers cause shes so damn obsessed with a guy how can I block her email from accessing facebook
Lol Rach, no I don't wanna do that its just that she uses my computer instead of hers. I'm not going to get a facebook account banned just cause shes using my computer lmao

[Rach]

unless you have her email to change or delete her profile you cant.. but if you get her to say something offencive of yours or get her to threaten you you can get her kicked off of facebook by reporting abuse lol