She could also be finishing with a growth spurt. I don't know alot about how Danes grow, but I do know that although my Pyr Naja is now as tall as she's going to get, she will continue to "beef" up for the next year or two (she's 1). Meaning muscles will develop and she'll get wider. Now she'll go through spells where she'll eat everything in sight then stop eating what seems like all together, and during those times people that see her tell me how much she's grown.
(I guess I don't see it 'cause I'm with her every day. lol)
I would agree with K.N.G.M.'s vet and say that if she seems normal in every other way (energy levels, drinking her usual amount of water, and no booty blowout or vomiting), she should be fine.