TNR-- but cat may be spayed? Also will she hate me after?

There is a feral cat who hangs out on my porch all the time. I would like to get her in to a vet, and do TNR but she is missing part of one ear and I think it could be an "ear tip" so she possibly was already spayed? Is there a way to tell for sure? The thing is I've never seen another "ear tipped" cat in my neighborhood and so I am not sure about that or if she might have just gotten the ear cut some other way. It's the right ear for TNR and is an even cut.

Also, she has been hanging out on my porch on and off for a long time and I am worried that if I trapped her and took her in to a vet she might become scared of me and run off and never come back. This is what happened with the last cat I had TNR'd, after I released him I never saw him again.
I could possibly get her in a carrier which may be less traumatic than a trap but of course the vet and everything would still be scary. Plus if I don't use a trap I cannot take her to the low-cost feral TNR program, so I would have to go to a regular vet and pay full price and find some way to pay for it (I am broke).

It would be great if you can attach a picture of her ear.

I would bet she is fixed. If the cut is straight, there is no other way for her to have such a clean cut. Impossible really, unless in some rare thing someone cut her ear with scissors, but that's HIGHLY unlikely.

So she would be fixed and had a vaccine. She should be fine!

Is there a way to borrow a trap?  Of course, if she's already been trapped, she may not go in one (they get trap savvy once they'd been trapped once)

The vet can shave her belly in the likely area of the spay scar.  If she's been spayed, she may still need her rabies, although without records, there's no way to tell.

But it does sound like she's already been TNR'd.  She may have left her colony due to territorial issues or she may have been moved and gotten lost.

Thank you for taking care of her.

Also, as you know her a long time,  and didnt get pregnant, this is a strong indicium she is spayed - or at least, more or less sterile.   Thus, believe it was a TNR cut, not a sheer accident.

Tx for caring!

Good luck!