Wat breeds is she a mix of?

Hi everyone, I just adopted a 3-4 month old puppy from the Miami-Dade animal services and I'm curious to know what breeds she could be mixed with. She is weighing about 20 pounds right now but is a little malnourished as you can see her hip bones and spine very clearly. Is she still too young to really tell?
I posted some photos of her here, let me know what you think
http://s1293.photobucket.com/user/fio12/library/?sort=3&page=1

I'd say Border Collie and maybe Dutch Shepherd? But Dutchies are kinda uncommon depending on where you're at. I was gonna say Bully breed/Border Collie mix, but the more I looked at her the less it seemed like she was a Bully. Still a possibility though!!

I see plenty of bully, not sure what else yet. It will be easier to tell when she gets a little bigger.

With maybe some border collie splashed in.

I'd say maybe Aussie shep/lab. I sort of see pit bull but I feel like if she weren't brindle I wouldn't be saying that, so not sure.