Hi I have trapped a stray before, I sat in my car for about 5 hours for 3 nights, what i suggest is, if you can sit and wait for a few hours on a night, you may be able to catch her. If you don't check the trap often something else might get caught and be in there all night. It will also alert nearby cats to be wary of it, thats if another cat gets caught and is wailing it's head off all night. Just a suggestion. Good luck in catching her.