
What about a spaniel bowl (the ones that taper in to keep the ears out)? I'm sure I've seen lower, wider ones for food rather than water that might be ok for a dog lying down.
Or, does she have to lie down? Could somethineg in between a floor-bowl and a raised bowl help? My lot got a new bowl yesterday - it's a 15L garden trug, about 12" tall so it's sensible standing height but not too high, and not so low they have to stretch to drink.