Well, DUH! Where *else* is she supposed to be?
Why do you think your bed is so big?
If I'm on the couch, they're next to me or on my feet. If I'm on the bed, well, all the dogs are there, too. Part of it may be that they know Mom ain't gonna be NO place that isn't comfortable. They like my bed, especially if it's made up and all the pillows are on it. But if it's ready for sleeping, all the SOFT pillows are there, and that's good, too!
But what it all boils down to, they just want to be with you, even if you were on a bed of nails
. Snuggle her close and give her an extra nuzzle
(and enjoy the movies, too)