M.D.
J.,
If your doctor isn't to worried then I would be either. Just keep giving her the options. Is she having enough wet and dirty diapers? That is a big factor if she's eating enough. I noticed when my youngest 2 years old, when he was around 6-7 months old, he really wanted to eat the foods we were. I am still breastfeeding, he won't give that up as much as I wish he would. Maybe also having an older sibling she's watching and wanting to be like. My older two are 13 and 11, my daughter the oldest. Her younger brother (11 now) has always looked up to her, he started walking at 7 1/2 months, and I know it's because he wanted to follow and be like her. Maybe your daughter wants to be like her big brother.
I hope all turns out fine, I know what you mean about dumping out pump milk, it use to drive me crazy when my husband, (stayed at home with our baby) would pour out my milk because he wasn't drinking that much.
Good luck!