Cat hideaway

I wasn't sure if this was the right place to post this so feel free to move this if it isn't.

Lexi likes to jump up on my desk since the other cats pick on her and it's the only way she can get away from them. What I want to know is if there is a hammock or any type of device for a cat that I can get somewhere to hang from the ceiling where she can jump from the highest point of my desk and get into to lay in. A place where she can get away. I don't know if anything like this exists.
Anyone have any ideas?

Well I know a lot of people buy the "ferret" hammocks for cats to use in show cages. Not sure if that would work because it probably doesn't look too "safe" as a place to be jumping from a desk. Since the hammock will sag when the cat jumps, they may panic. A more solid shelf would work better. BUT the others might see how she jumps up there and do the same thing.

Maybe you can get some boxes, cut holes in the side and it would be more like a little tent - or get some cat beds that are more enclosed.

A hammock is a good idea, but not up high. She may panic or roll over and fall out, and I'm sure she'll land on her feet, but still. Just buy some cheap shelf brackets, and put a sturdy shelf up there. Make it so it comes out far so it's big enough. Maybe make it her own little shelf with a cat cubby and toys.

Thanks for the ideas! She already sleeps on my desk to get away, but thought she'd like something more of her own. I'm not worried about the other cats. They have seen her many times jumping, but they never jump and never will because we have trained them not to. She was an outdoor cat so there is no way to deter her from doing so.