Might help with warmth to place a heated blanket on top of the mattress with fitted sheet over it for her to sleep upon. I think there are heated mattress covers available, also. If reluctant to use electric blanket, perhaps a sheepskin or other warming covering? I recall "bed cradles" used for individuals with burns. Placing it over her bed, and covering it with impenetrable blankets/covering might help. Found several web sites for "bed cradle". best of luck. madelyn