I would make sure the vet has ruled out all & any medical problems, maybe even a second opinion if you feel there is something more to it.

If all medical possibilities are ruled out than dogs like you described are ussually either picky eaters or they train their owners to spoil them. If you can tell the difference then thats great. But either way one of the foloowing suggestions should work. If she is just plain picky then find a food she loves and just leave it out for her, when she gets hungry she will eat. If she has you trained to feed her & spoil her like that then I would put her food down for 20-30 minutes & then take it up no matter is she has eaten or not. because she is such a large dog then I would do this maybe 4 times a day, once she starts eating then knock it down to 3 times a day.

Also by feeding her ONLY her dog food, that means no treats, just give her her dog food as treats may help. but not too ften that she is still being hand fed. Make her do a command before giving her any treats.

if you think she is just spoiled then I would personally just place the treats on the floor instead of directly in her mouth.

good luck, & oh nay pics? I love danes!