Yup, sounds like she's in heat. Better make sure to not let her get out or she will be a mama real soon. I'm betting the other cat outside is an intact male. And they become really creative about door dashing when the hormones are calling. Please plan to get her spayed asap, it will help eliminate the possibility of health issues with reproductive organs further down the road and, of course, eliminate the possibility of unplanned kittens.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...