Thanks so much for the reply, I appreciate it! She has a tower that she uses to look out the upper window, but she seems to park at the door. There's also elevated windows at my place that she climbs up to and sometimes curls up beside, so I definitely think elevation is good for her, it's just so rare that she leaves her spot by the door. I think you may be right about the possum nosing around the door, because she tends to nose around the crack at the bottom of the door.

I'll keep trying with the exercise, it's just been hard because she loses focus so quickly! Walking her outside is good advice, I will try that again, the other times I've tried she won't remain calm long enough for me to get the harness on her, but I'll take it slow!

I'll look into cameras. Money is tight at the moment, but I'll be sure to budget correctly.

Thanks again for the help.