I purchased an app that was 9.99. I want to give it to my gf to use in school. Is there any way that I can download it to her computer or ipad2 without having to pay for it again?

I think you would have to log in to your account on her iPad and then you should be able to download it again

And then every time it needed an update you'd have to log into your account on her iPad again. Since she is a girl friend, not an immediate family member, the legality of this is dubious at best.

It would be better to just show her how much you care by spending the $10 on the app. A couple roses would probably cost more.