@DebraDownSouth:
She needs much more exercise. A tired dog is a good dog.
Humping is dominance, male or female. Yes it is common with females.
In every situation, someone gets trained. Please view the posts and make sure you are the trainer, not the trainee.
Putting her on a lead and teaching HEEL helps to show you have control, that YOU are making her stay with you, and teaches her where her body needs to be when near you.
If you have to use the squirt bottle all the time, that isn't training… it is avoiding training through aversion techniques. Not saying the water bottle is BAD, simply it is short term avoidance of the issue.
Doesn't sit fast? Hello, you say sit ONE TIME, then you place the body into sit and say GOOD SIT. Going at her own pace is another measure of controlling you.
Respectfully, I disagree with some of this. I've had both male and female try to hump when they are "just" overstimulated – keyed up, hyped up. I dunno if I'd automatically see it as dominance -- or at least not as JUST dominance -- especially since she's been crated nearly 24-7 her whole life. I'd be very keyed up if I suddenly had so much extra free space under those circumstances.
I definitely would not be forcing a sit or really forcing anything other than "life-saving measures" with this girl. I realize there's a LOT to deal with here, but I'd be using the food and attention to shape her behaviors into more acceptable paths, period, and use the crate when you're feeling overwhelmed. She's not MISbehaving, not deliberately, not willfully, she's just doing things she knows to do. Please, please, don't see this as a battle of wills. It doesn't sound like it to me at ALL.
P.S. I'm armchair quarterbacking, yes.