Hi, cruella. Why don't you try & get a cat trap from the CPL & put some food in it for her? Hopefully, you'll be able to catch her then & take her to a vet to have her checked over? If you've got a local animal sanctuary, they'll probably lend you a trap & if she goes in it, you won't have to handle her, as it's like a carrying basket. Good luck!
p.s. I've got to try & get one of my old ladies into the cat carrier today (should be fun...!) - she's limping & there's what looks like a little puncture wound on one of her pads, so it's off to the vet's for us, too. K xx