I have TNRd in the past and have two ferals living with me. I put out some dry food we shall see if she shows up again. I have never seen her before. There is a real feral problem where I live. I know she is a female and Do Not want her to reproduce!
We found our last rescue eating what was left of tomato plants in our garden. I was scared she would be poisoned but I was able to trap her relatively easily. She is now the only one of our cats who seeks out my lap.
Thank you for doing what you can for her. If it is only fixing her and releasing her, she will be far better off.
The semi feral we care for at the stables used to survive by stealing the horse food from people's feed bins. Goodness only knows how long it went on for, but it's left her seriously messed up.
I hope you're able to help this little girl. It sounds as though she needs it.