If you don't figure a way to get her out from under your bed your going to have a much bigger problem on your hands. A sick dog under a bed has only one possible conclusion. Pee, runny poop and or vomit in a very hard to clean place. The dog needs to go to a vet.
My dog is sick, she won't come out from under the bed, won't eat or drink water, and warm nose. What could it be?
It could be time for a trip to the vet.
How in the world would anyone on a public forum know what is wrong with YOUR dog .. When YOU don't even know. You do like anyone else would do that has a sick dog .. You take it to a vet to find out what is so seriously wrong.