
Hi Vicki,
I'm guessing you are in the US (we don't have Little League in the UK!) so I don't know how the AKC works, but I imagine it's similar to ours, where only the breeder of a dog can register it, and then only if both its parents are registered. Without knowing the names of your dog's parents, how would it be possible to get a pedigree - you can't just make one up!
You could try advertising that you've found her, love her and want to keep her, but would be pleased if her former owners would let you have her paperwork. Other than that, just enjoy her as your pet.
:)