I am no expert, but I remember watching some nanny show that told the parents that it was forbidden to bring the child in with you because that creates a sense of dependency that will be much harder to ween her from.
If she thinks that she can get you to do everything just by crying, she will learn that it is her only tool for attention and you will not be a mother, but a slave to her every cry. It hurts, but you have to let her cry it out. it is a strength of independence that all children living with a single parent must learn.
Try making it an exciting event in making that room hers, decorating it and maybe painting it a new color. Anything that might help her adjust and become accustomed with the room.
You might lose more sleep with not allowing her in with you, and she might lose more; but it is essential for her to learn that you are her parent, not her slave. It might take a while in getting her to adjust, but you have to be stern in telling her no.
Good luck