Hi there
My experience has been to do everything in either sidelying with pillows propped under her stomach, between her legs, under her head and hugging a pillow.
If sidelying isn't comfortable try having her sit in a chair and lean up against pillows against your table. Drape from front to back like a hospital nightgown (open in the back).
Keep it short and relaxing. No heating pad!!!!
Good luck!