How can I block one of my friends on facebook from writing on my wall or commenting on my wall posts?

It’s my aunt so I can’t really delete her…

Im pretty sure you cant but I know you can make it so certain people see your statuses and also stuff you post on your wall but not stuff you post on other peoples walls. You just go to the corner of the box you put your status in and click on the lock and select custom. Then type in the name of the person you want to hide it from or want it to be visible too (: