Maybe sew shower curtain rings on all 4 corners and tie to those 4 areas on bed....mom can move but covers will stay on.

They also still make footie pjs. And remember those sacks we used to zip up the babies in. Actually if she is restrained in any way that may cause anxiety. Can you put more heat in her room and then covers may not matter.

Cathy, google zip up bedding on Amazon. Maybe something like that would work for her.

EvelynDubree, I bought my husband a weighted blanket, works well.

John does the same thing.I get up a couple of times and cover him.