Why did she do this? Is she trying to show off?

she is being selfish and materialistic. delete all of the pictures of her and your ipad, and take a few of you. it seems as if she is taking advantage of your friendship, and you should not let her do that. break your relationship with her, as it is a false one. you dont need to take the pictures off of facebook, you could tag your ipad in them with "(your name)'s ipad" showing that its not hers, but yours. dont make a big deal out of it, let her do it. try to have her do it in public so people can see how petty she is. if she messages you why you tagged them then post on her wall your response, possible scaring her of seeming shallow. also maybe download facebook for ipad so that many of your posts will say "via ipad" showing that you do indeed have one