Kitty Visitor

So for the last few nights, right after dinner time....we have had a cat visitor at our house. I first caught her rummaging in our recycle bin and thought perhaps she was hungry-- so 2 bowls of food later, she warmed up to us. Problem is...she is VERY vocal. First night she was so eager for people attention, she wandered around the perimeter of our house, meowing at everyone's bedroom windows.....for HOURS. It was rather annoying and heartbreaking. My cats are not friendly to outsiders, unfortunately. So outside she stays. She appears to be pretty clean, I didnt feel any ticks on her (usually the strays have ticks all over them)....so I really think she has a home and is simply being let out for the night. Problem is, people....your cat doesnt WANT to be out for the night. So now we have become her nighttime home. Yes, i keep feeding her. You show up at my door hungry, I will feed you. Last night she left us a dead mouse on our porch stairs, as a thank-you. My own cats have sucked at mousing. They need to step up their game.....part-time kitty is making them look bad.