Have you considered that maybe your DD has silent reflux? This could be being made worse by the fact that she wants to eat so much because when she is feeding it makes her feel better, but then after she wakes up crying because the reflux hurts so she wants another drink to 'soothe' it? I say silent reflux because I am guessing your daughter isn't bringing up any of her feeds? My best friend's DD2 had this - once it was diagnosed and she could remedy this through some medication and a heavier formula, it was like she had a new baby!!!