Maybe take her pillow in with you if she has one? Or maybe a special treat of taking mummy or daddy's pillow to lay on might help? Also it might help to expain to her that the nurse has to take special photos of her tummy so you can make it feel all better & if she lays nice & still they'll get some good photos & she can have a look at them when they're all done????

Dunno, never been there before but that's what i can think of.

Good luck tomorrow.