Tortie cat found in International District/Chinatown

This lovely tortie girl has been hanging around our apartment building in the International District/Chinatown for a couple of months. Someone posted fliers around with her photo, but as far as I know nothing came of it. Then, about a week ago, my husband and I found her in our parking garage with a litter of kittens. We fed them for awhile and tried to put together a shelter of some kind, but there were some cold and wet nights (and fireworks when the Seahawks won, which terrified them) so we took them up to our apartment to get them out of the elements. The kittens were at least 6 weeks old, maybe older, and they were eating wet and dry cat food so we found homes for all of them. We would love to keep mama cat, but she does not get along with our other cats so she's been separated from them in our small spare room. We took her to the vet, and she is not chipped. We're posting here to hopefully find her owner or a new home. We have tried contacting Alley Cat Project, Paws, Meow Rescue, and others. None of them are getting back to us, and the shelter won't take her because she is a healthy stray. We're getting desperate because she can't stay in that little room for much longer. Is this your kitty?