If she has a black tongue than I would bet Chow Chow. She reminds me of a stray/feral I've been feeding for awhile now. Except I have a feeling his is mixed with pit bull, while your girl has something making her face more narrow (such as GSD).
Jinx, he also has a purple tongue:
His littermates, which helped with breed guesses (I caught this girls and luckily found a rescue for them):