I ran into a problem with my Final Fantasy XIII data that I moved from my friend's PS3. Said that it was made by a different user (even though the names were the same). I found out that the problem was that I had not logged into the PSN with my new PS3. After I signed-in one time the file could then correctly see that the account was mine.
So she might just need to log in so that the account can be linked, or activated, or whatever cool term you wish to use. There is also the problem of some game saves not being transferable. I hope that in her case signing in to the PSN with her ID and password will work.