Thanks for your replies. I'm willing to care for her for the long haul (however long that is...) since I already have 2 cats and I'm buying the food anyway! I feel bad for her...there are some cats who are lucky and some that aren't, and I can't help but worry about her. I put a cat shelter out for her, but I don't know if she is using it. I can't really tell..although I did notice her go under my deck yesterday, which is probably a decent shelter for her.
Apparently she is already fixed, because her ear is tipped. I was going to try to trap her (I trapped a few others before she started coming around) and I snapped a picture of her because it looked like her ear was tipped...I showed it to my vet and she said that there was no doubt that her ear was tipped. The curious thing is that this is the 2nd cat that I have found who was already fixed....where the heck are they coming from?
I can't imagine any of my neighbors doing any kind of rescue or TNR.
Anyhow, I moved her food a little closer, and it's beeen fine, but I am not going to put it right outside my door because I am afraid to attract raccoons so close to my house.