Best of luck with it all. I struggled with my DS who had similar waking patterns to your DD in your recent post. I was so tired, DS wouldn't co-sleep, I was struggling at work and honestly, I probably shouldn't have been driving I was so tired. I wish I got some help before he was 13 months old.
Getting help (through a sleep consultant) saved me - DS was happier and it worked for our family. My DD is 7 months at the moment and I will be getting help in a flash if I start to feel things go the same way.
On a side note, when I was looking for help with my DS, the MCHN thought I was over feeding etc as well but even once I night weaned, dropped day feeds etc he never increased his solids intake and still at 4yrs old is a very small eater while DD eats like a pro at 7months - sometimes gobbles more than me. It's so individual it and like you I believe food before one is all about experimenting and exploring for bubs.