Take 'em to the thrift store. If you regift them, there is always the danger of your daughter suddenly recognizing them. My son can ignore something for MONTHS, but if he sees it in a give away bag it is suddenly his favorite thing, ever.
Besides, then it becomes someone elses problem, KWIM? Very few parents are saying to themselves, "You know, little Susie really could use a few more stuffed animals!"
If you can't think of a reason to keep it (ie. someone special gave it to them, it is their frirst teddy bear, or first gift received after birth), get rid of it. I don't think you will have any regrets. I have purged stuffed animals several times, and Dylan still has so many to play with that I don't think he has noticed. There are a very few that he has a real attachment to, and the rest are usually background noise.