She does cry more when I block her off to the passage if I'm here - how do you start crate training without making it a bad experience for her?
I second and third the comments on crate training being a good life skill for any dog. If nothing else, they are probably going to experience being put in crate-like confinement at sometime in their life at the vet.
I wish I could answer your question in a helpful way, but I can't. My first Rottie was a backyard puppy. When I put her in a crate for the drive home, she did howl and fuss so much I ended up with her loose on the seat beside me for that drive, biting at my hands every mile of the way, really safe, right? But at night when I put her in the crate next to my bed - treats to lure her in, chewy available, and climbed into bed beside her, she was fine until the need-to-potty restlessness that woke me. I do remember that the crate in the car was all plastic with only a grated front door and the one in my bedroom was wire and open all around.
For the next one I flew from Colorado to Michigan, picked her up from the breeder, and put the puppy in a crate that would fit under an airline seat to drive back to my airport hotel (several hours on the road, one potty stop). That was a fabric type. I talked to her as I drove, put my hand through the top opening now and then, but driving unfamiliar roads at night, it had to be done that way, and she never peeped. The next day I put her in the same crate for hours for the flight home. She never cried and didn't fuss enough to worry me.
For my current dogs, things have been the same, plastic crate in the car to get home and wire crate by the bed at night - no fuss.
Except for that first puppy, it may be that the better breeders made a difference in that the puppies were handled and treated in ways that made them accept what people did. The two are not related and very different temperaments.
So I just gave the puppy some treats as I put her in the crate, made sure there was a chewy in there, shut the door and went to bed right beside her. I don't know if this made a difference either, but I noticed what Beta Man said about the puppy being in a "cold small crate." Mine were all in puppy-sized crates as babies, but they weren't cold. I always had some sort of bedding in there, which among other things keeps the crate from being noisy every time they move. In the house it was always a wire crate (if you use a folding one of those, be sure to fasten the ends that collapse inwards so they can't do that - safety precaution). On at least one puppy I had to run no chew stuff around the outside edge of the pad, but I always had padding on the bottom.
My experience with adolescent and adult rescue fosters was the same, as was the half-Rottie foster puppy I raised - they went in a crate by my bed at night when they first came to me. Only one (young adult) ever fussed so much I gave up and put him out in my barn (which I was lucky to be able to do). The problem with him was he was such a violent chewer, for his own safety, I couldn't leave bedding in a crate with him, and the noise of him shifting around constantly would have meant no sleep for me or him.
So sorry I can't say why what works for me works. I think it's having them right next to me, and of course Rotties in general may be more confident dogs than some other breeds, but I see from posts here and in other dog forums a lot of people are determined to keep puppies out of their bedroom and then post about screaming, miserable puppies. I'm not sure if I ever left one crated during the day before it had the experience of nights by the bed with me. Also, while they were all in small crates appropriate to their size, they were never in such small ones that they couldn't lay on their sides fully stretched out. I never squeezed them so nose was touching one end and butt the other.
Good luck with your girl.