First of all, has your daughter logged finds under her account? Is her account showing as "Premium Member"?
Here's the scoop on Favorites:
http://support.Groundspeak.com/index.php?pg=kb.page&id=287
Here's two bits of information from that article:
B.
Her account does show as premium now. She has logged over 200 finds as a basic member and this is the first time her account has ever been premium. I just didn't know if being a gift upgrade would make a difference.