She sounds cute! This is vaguely similar to how I got Embla. (She didn't invade the house, but we did the bonding-with-food-on-the-back-porch thing for a while.)
Check with the local animal shelters to see if anyone's reported a missing cat matching this description. (Call all of them; they don't necessarily share info perfectly.) If possible, you might also want to get her scanned in case there's a microchip; the collar suggests humans. (The animal shelters can either scan themselves or point you to someone who can.) I'm just guessing, but I would expect someone who's dumping a pet to remove any collar to make it clear that the cat isn't owned any more. I'm guessing "lost kitty" is more likely than "dumped kitty".
(no subject)
Check with the local animal shelters to see if anyone's reported a missing cat matching this description. (Call all of them; they don't necessarily share info perfectly.) If possible, you might also want to get her scanned in case there's a microchip; the collar suggests humans. (The animal shelters can either scan themselves or point you to someone who can.) I'm just guessing, but I would expect someone who's dumping a pet to remove any collar to make it clear that the cat isn't owned any more. I'm guessing "lost kitty" is more likely than "dumped kitty".