Please e-mail me. There are a few ways to do this, but I need to know if you're home most of the time and a few other details. My first recommendation would be to have you attach a kennel lead to a harness or collar that she normally wears and just let her drag it around. You might even want to do this and put her bed before she goes there on her own...maybe even add a treat to keep her there. The idea is that you want her to get comfortable somewhere that she is inclined to snap at you again. Only this time she'll have a leash attached to a harness or collar. DON'T reach for the leash when you want her off. Stand normally and tell her, off/come-whatever you want. If she doesn't respond the first time (and she most likely won't!) THEN you reach for the leash and have it in hand (make sure there isn't any tension on the leash yet) and tell her once again the command of choice and give her a tug. You decide how firmly you want to tug. Too soft and she may give you the doggy finger, and depending on her size, too hard and you might injure her- HIGHLY unlikely. However after only one day of you asking her only ONCE to do something and her getting pissy then correcting her for having to repeat yourself, you'll notice her attitude has changed for the better and she'll be MUCH more responsive. But still, contact me because there is more to this (not much) and a few other ways. And NO, bribing her and spraying her w/ H20 aren't going to fix this imo! lol
Hope to read from you soon.