First, take her with you to buy the linens for the bed. One set of sheets at least, and you can get the others, but having some say in what's going on will make her feel better. Toddler beds are little, too, so save yourself some money and buy a throw blanket to put on the bed instead of a comforter set. She can pick out what color she wants. Later, she can keep the throw, and it won't be weird for a teenager to still have a Tinkerbell comfortor stuffed in a drawer....
I would try her in the bed for naptime first, for maybe a week. That way, when it's finally time for nighttime sleeping in the bed, it's not an unfamiliar place.
Also, we found that when we transitioned our daughter, she was suddenly very interested in the freedom. So we turned her doorknob around and locked it. You have made her room a safe place. It's just as safe at night. You probably also still have a monitor in there. She will fall asleep, and probably wherever she happens to be. It might take a night or naptime or two, but she'll soon learn that it's more comfortable to sleep in her bed, and it will be a lesson SHE learned all on her own, instead of one you tried to tell her. You can decide when you're ready to unlock the door. She was stuck in her crib, now she'll be stuck in her room; it's really just a bigger crib, with more access to toys, right?
That was a case of curiousity more than anything, and exploring newfound freedom. For crying or other actual protest, though, I would go with the supernanny or Ferber advice. Go in, visit, (we did Ferber, visit after 3 min, then wait 5 min, then wait 7 min, etc) but DON'T CAVE IN. It's still bed/naptime, and you're still the mom.
Good luck, mom!