Interesting thread - I've enjoyed reading it! Haven't been around much. Real life has kept me too busy! *L*
Roxy'sCD, you've had a ton of great advice here. I agree that you need to re-assess your leadership with Roxy, and in the process make the rewards something that she really tries to earn. So often we ruin the rewards by giving them too freely .. at some point they just become expected and are no longer really rewards. We all fall into that trap at times (my dogs get a bit too spoiled on occasion too).
If a crate is more than you can handle, consider getting an exercise pen. I love my ex-pens and use them quite a bit. It gives the dog more room and less confinement but can be very effective for the leadership training. In addition, they're easy to fold up out of the way.
As far as the e-collar goes, based on your descriptions of your dog's behavior, I think it would be the wrong way to go. What you described was the use of the e-collar as a pure punishment. A punishment like that can really backfire on a dog and create a huge problem. I'm always uncomfortable with people who want to jump in and use a huge correction because they haven't figured out how to motivate the dog any other way (I'm talking about your trainer, not you). A good trainer should have a huge arsenal of motivating techniques available and shouldn't be depending on corrections to train. That's not to say that there isn't an occasional need for a correction, but from what you've described the leash corrections are already shutting your dog down. An e-collar would probably make it worse.
If you were training with me, I'd have you put a flat collar on Roxy and do a ton of fun behaviors. I'd have you re-establish your leadership (already described for you). I'd recommend doing very short training sessions. If Roxy can't handle three stands for exam, do one and go on to something else. I'd have you teaching her all sorts of fun tricks .. and teaching you to see all the trained behaviors as fun tricks, instead of thinking that obedience has to be so stern and formal. There are so many things that you can do to keep things fun for you and your dog. If you're getting frustrated, it's only going to stress Roxy. You both need to have fun.
By the way, I have an e-collar and I have studied the techniques and am using it on occasion. I REALLY think it's a travesty for people to use an e-collar for general training. A ribbon or title is just not worth it to me. But when it comes to serious behaviors, there is a time when a consequence may be necessary. In my case, I spent 18 months training and ran into a problem that was serious enough for me to research the e-collar. And then I used the collar as a negative reinforcement and not just as a punishment - and at the lowest possible working level. It was never used to just "zap" a dog to creative a correction.
Oh - and I train and show chows in obedience and agility. I understand completely the frustrations of dogs that have little interest in doing obedience maneuvers. The best thing I ever did was to learn to be enthusiastic, happy and positive with my dogs. I train at a high level of energy - but I train for very short amounts of time. Yesterday I went to a class at the training facility to get my dogs some exposure in working around other dogs (I just wanted to work on the outskirts of the class, which they allow me to do). I spent less than ten minutes with each dog. We ran through a few things and then I ran them back out to the van. I get much better results in a few short sessions a day than I do in one long session.
My last bit of advice .. spend some time just observing your dog. See what makes her really tick. See what motivates her. Try doing some behaviors in your home without a leash or collar - just use your happy voice, lots of encouraging praise, and then maybe a run to the fridge to find a special treat when she does something for you. Ask for something simple at first! And then after giving her the treat just wander off and do your own thing again. Keep in mind that small bursts of training are very effective!
Good luck to you -
Melanie and the gang in Alaska