Russian Blue kittens & cats in Vermont

I adopted Millie from Arizona. She was a year old at that time. So she is 8 years old now. Millie has been a good kitty, not always looking for attention and coming to sit on your lap at her discretion. She does not like to be picked up.. She is also an indoor/outdoor cat, and would not be happy staying indoors all the time. She might be a hunter, but I live near the woods and she has never brought me anything that she has killed, and is always hungry when she comes inside, so I assume she doesn't kill and eat anything. Millie is sweet, but very much a cat wanting her own way. Recently she has wanted to go in and out regularly, scratching on my furniture if I don't notice her at the door. That is the way she signals me that she wants something. She has a small cat tree with some scratching posts, but maybe would do better with a larger one. I have enjoyed my 80th birthday, and also have a dog. So I want to insure that Millie has a good longer-term home.