help!!! found a pigeon hard balls on its toes.

[Jello]

As I was driving home from work I was stopped at a redlight and noticed a pigeon in distress. It had large brown balls stuck to toes...calcified poop or something? It seemed very tame, I put my hand under her and she stepped onto it without hesitation. I am pretty sure she is feral. She has a couple of bald spots on her breast, and an empty feeling gullet but her balence is good. I brought her home and soaked and moisturized her foot and cut away the deposits, her toes seem to be in good shape a little swollen maybe. She is in my apartment now in an 80 gallon aquarium, I bought her food, and gravel and supplied a heating pad, but am not sure what I should do next, she doesn't seem to be eating. She also appears to be young, she is completely black, and her beak is grey but rather large. I am not sure what my next step would be scared to release her as she is so tame and slim.
Also I was wondering if she poses any threat to my other animals, dog, cat, guniea pig.
thanks