Can I refuse to drive over to my friend's house to tutor her in math?
Why won't you tutor your friend?
I don't like to do anything for her.
It's not nice to not help a friend out. If you don't enjoy tutoring, you should tell your friend so she can find someone else to help. Not helping her might cause her academic trouble.
Why should I, making her work herself to death does not make me a bad person.
That is very rude of you. She is supposed to be your friend and it is rude to refuse to help her. She might not know anyone else that knows the information like you do.