Thank you for your response!
I don't know if she is truly feral, I do not that she is a female and is spayed already because of the ear tip. So who ever had her before, probably trapped her and had her spayed. She does come when I call, tail up, seems relaxed, until about 4 ft from me. Then she will stop, and rub her head on anything, and roll on the ground. She looks like she really wants that affection and trust. I do think I will have to trap her to get her in though. I am hoping this works out, I have been worrying about her for almost a year, spent half the winter crying watching her out in 11 degree weather. I also have another cat, and am worried about him when I do get to bring her in. I have a separate room for her, with a screen door on one side, and plexi glass on another that I am making for her. Please pray that this work out!!!!