My LO1 has never really drunk much cows' milk. He was BF til 17 mos and never took to the other stuff (unlike LO2!). He does eat lots of cheese, broccoli, bits of yoghurt etc.
I'm sure I read somewhere that there is a developmental phase of becoming picky, or suspicious, about food - it occurs naturally around the 18 mo mark (I think?). It might help if you share the food with her, or she sees you eating it first.