Great news, everybody - I saw Come Here in our backyard when I got home from work yesterday so went ahead and set two traps last night. Got her!
She's in my spare room now, under the bed and little scared, but okay otherwise. She let me pet her a little and even let me put some Frontline on her. I'll get her to the vet first thing next week, then start working on finding her a home or placing her with a rescue. I'm not sure the same place that took Sylvester will be able to help at this point, but will certainly ask. I'd actually like to give Come Here a couple of weeks to calm down and feel safe before doing anything.
She's such a gorgeous girl. I can't wait to brush her when she's up to it. Will post pics later. I'm also thinking she needs a new name. Come Here is cute but definitely doesn't suit her. Will start another thread for suggestions.
Thanks so much for the vibes/prayers, guys. I'm so relieved Come Here is safe inside!