Well, Resource guarding is a tough one, especially when it's against other dogs. I'll have to think about it a little and see what I can come up with...
A couple of ideas here
Prevention... Do not let her practice bad behaviour, the more she practices, the better she gets at it. Keep her away from the space she's guarding, or keep the other dogs away from her space for now.
Give her one crate that's hers, and dont let her get into any other crate. Teach her to go in her crate, and reward her for doing so... You can do a bit of redirection training here, and teach her an incompatable behaviour. Basically, you'll want to teach her to go to her crate when she see's another dog... and possibly set up a barrier that's really long (like an x-pen the length of the room with her crate on one side, and the other dogs on the other side), so if the other dogs go to their crates, she has to run alot farther to try and get into their crates in front of them.
Or completely block off the room, except when putting them in their crates.
Try to have one or two more beds or crates than you have dogs, but spread them across the house, this can sometimes help resource guarding. With an abundance of resources, she will not need to guard (this does work in some cases)
Hope this helps... I'll see what else I can come up with for you...
