S.W.
You'd probably appreciate the book "My Child Won't Eat!" published by La Leche League. You could order it at www.llli.org or you could look up the contact for your local LLL Leader and she'd probably have this book in her group's library for you to borrow for free.
It's very informative and not just the same ol' re-hash of eating advice. I liked it a lot.
My sons were not really "sold" on solid food until they were nine months old. If she still has the tongue-thrust reflex, she may not be ready for much solid food. And calorie-wise, there is not much solid food that has as many healthy fats as your milk, so that's your best bet for helping her fill out a bit. Best wishes!