Good luck on that one. My yorkie owns me and I pretty much do what she wants me to do. I just recently gave up my side of the bed because she decided she want it. I think most of on here are pretty much bow to their whims.
Seriously speaking. You have to establish who is the pack leader. Pick one word that you want her to obey for her doggy bed and with treats and persistence, she will go to her doggy bed whenever you want her too. Place her in the doggy bed while saying the command, give her a treat. Pretty soon, everytime you say that word, she should go to her bed. Be patient, it may take her time to catch on. Sort of like the potty command. When I want Brandi to go potty I say "potty" and most of the time she will go potty.