I think Olivia and Showpug gave you good advice. A combination of desensatizing her from a more comfortable distance and gradually closing the distance between her and the vaccum is a way to get her use to it....and being sure not to reinforce her fears with attention. When she gets to a point where she is more calm, assoicate the vaccum with some yummy treats and play time. You can even bring it out and not turn it on and feed her next to it. Turn the bad, scary thing into an OK thing. LOL.
My little girl Chihuahua has never gotten completely OK with the vaccum. It's not like she's afraid so much as she just doesn't like the sound of it. She goes to the other couch when I come near the one she's on and then moves to another chair when I get close to that one. My Doberman on the other hand can be sprawled out on the floor and I can vaccum all around him, right up to him as long as I don't touch him with it. So, the floor where he is lying doesn't get vaccumed unless I am feeling more cold hearted and ask him to move. But it does get clean right up to him, inbetween his front and hind legs, between his ears....LOL. just kidding.
Yes, gradual desensatizing and no fuss about her fear.