What does "leave her there" mean? Do you actually leave?
What you've got to figure about crate training is that the aim of the exercise is to persuade the puppy to come to see the crate as a relaxing, if not enjoyable, place to be. That's not really going to happen if she's put in there and left on her own. In those circumstances, she'll see it more as a prison and it's natural that she'll find it stressful. Since that's the opposite of what you want, it makes some sense to try to avoid that.
Often, a good way to accustom a pup to the crate is to choose your placement and moments well. Keep the crate in your living room, or wherever the centre of activity is in your house. If you spend the evenings watching TV, then the best place for the crate is alongside the couch or wherever it is you're going to sit. If you spend all evening in a den or office on a computer - crate goes at your feet. The point of this is so that any time the dog is in there, she is NOT isolated away from you, but rather is still right there amongst the family. The crate then has a chance of becoming her private bed to relax on.
Good times to pop her in there then, are the times that you're going to be sitting right there doing something inactive (like watching TV or surfing internet). When the dog would probably choose to sit at your feet anyway. At these times, you could just encourage her into her crate, give her something to chew on, and with some luck, she'll settle down reasonably happily. It is only short periods that she should be in there anyway (also pick the times she seems sleepy).
Does that make some sense to you? If the crate is well placed, you're right there, and you choose quiet times when she'd just be dozing anyway, you're far less likely to meet resistance from a stressed puppy. Over time she should become relaxed and happy with the crate, and hopefully even come to see it as her place to relax in. That's less likely to happen if she's forced in and then left alone there - so do try to choose the times when you're going to be right there doing nothing exciting anyway.