We never wake up with less than two or three in the bed with us. I never ever want my bed to be cat free! I wish they would be less hoggish at times but I never want them to leave.
I realize this is a personal choice but if you leave your door open she will be in the bed. Cats love the warmth of snuggling in bed. I think that if I was determined to not have a cat in the bed I would just shut my bedroom door. Although, at my house that would result in howling, screaming, scratching and all out cat fits if I didn't let them in!