Put something like aluminum foil on whatever it is she wants to get comfy on. When she jumps up on it, the sound and feel of it may startle her and keep her from going on again. If you're going to try this out be close by so that you can see how she reacts, she may just be the type that thinks the foil is a lot of fun and start to tear it up and eat it, and that's not good.

The Puppy Blog
http://puppychi.blogspot.com

Dog Portraits
http://www.waterart.ipfox.com