Well, I’ll chime in on the Shepherd and Boxer train, even if y’all did beat me to it.
She’s got a couple of features that definitely looks like she’s got some German Shepherd in her. Her body and muzzle and coloring look Boxerish, but it’s really hard to tell at that age.
There’s a fair number of Aussie Shepherds and Border Collies with blue eyes.
I don’t really see anything that looks particularly pitbull or lab to me, except maybe her coat, but that’s hard to say from a pic.
Australian Shepherd and/or Border Collie
On preview: damn, now someone’s beat me to the herding dogs, too!