Becky, I'm so glad you trapped her! We feel the same way you do - we do the same for outside ferals as we do for our inside pets. We do have them tested for FeLV and FIV. I don't know what we would have done if any tested positive. When the colony was up to 28, we probably would have put them down. I don't know. But with one, I'd use it simply as a tool to monitor her health, you know, to know whether or not there's a problem coming down the road. The vet will help you decide when she's in pain and when nothing further can be done if either turns out positive. Knock wood, and I'm sending up a prayer that isn't the case.
Now - we've found a shelter only a few hour drive from here that takes FeLV and FIV positive cats only, so that's what we would do if any ever tested positive.
Microchipping can be a bit expensive, but it would ensure that you'd get her back from the local shelter if she ever turned up there. Just check with the vet that the protocols of the microchip they use can be read by the local shelter. No point in microchipping her if the local shelter doesn't have a reader that can read it.
Worming treatments, unfortunately, have to be administered once a week over a course of several weeks. Make sure the vet uses panacur or Strongid-T - I don't know about down there, but I've "talked" to several people around the country, and everyone seems to have problems with round-worm resistance to Drontal.
How to administer the follow-up treatment? I don't know. Either trap her again and get the vet to do it - or learn to be brave with gloves. I really don't have an answer for that. Don't EVER try anything like that with a cat you don't know unless you have a rabies vaccination yourself. But once she's had her vaccination, at least you know it's not fatal if you get bitten, if you ever want to try. Unfortunately putting the panacur or Strongid-T in food probably won't work. For an adult cat they're rather large doses of liquidy stuff, and the food will smell awful to kitty.
But at least one initial dose will kill the worms already in her system. It's the eggs it won't kill, so they will become worms again. That's why it's administered over several weeks.
But you never know - you may get friendly enough with her over time to be able to administer another dose of flea and tick medication. There is either Frontline or Advantage that is a 3-month dose though! See if your vet carries that - it should take you through the season.
And since you've decided to treat her like a pet (which I LOVE!
), I think it's about time you start working on names for her....
And if you keep feeding her, and if you're ever out there while she's eating - just out there so she can see and smell you (and you can put a stinky sweatshirt under her bowl so she associates the food with your smell) - over time she'll come to trust you, and you just never know whether it'll be a couple weeks, a couple months or even a couple years (though doesn't sound like it given how things are going at the vet) - but one day she will very likely walk over to you and headbump you. Take it slowly from there, cats easily get overstimulated from pets, especially if they're not familiar with the sensation, but even our outside ferals have become big ol' loving bunnies so to speak.