dd2 is the same age and I'm having exactly the same situation. She fed alot during the night, but since 8am this morning hasn't been interested in anything more than a couple of gulps.
She is blwing though and so far this morning has eaten a several pieces of pasta, quarter of an apple and a whole . I'm sure if she was given some food now she'd devour it, but as for milk .
I think I may be giving her too much food, but she grabs it and shoves it in herself, its not as though I'm force feeding her.