I'll just share some of my experiences...
My first (I have 4 and one on the way), would not eat much, if anything, except mama's milk until he was 14 months old. He was introduced to solids at 6 months, but was just not interested for the most part. The first time we offered solid food, we offered him some avocado. He grimaced! I'd never seen or even imagined that a baby could make such a face! The next time we gave him a bite of banana, and he loved it and wanted more. (Yet our 2nd loved the avocado too.) We have never done the baby-food-in-jars stuff from the store, we just give tiny bits of what we eat (fresh vegetables, whole grain bread we ground and made ourselves, yummy legumes cooked and spiced up nice, and fresh fruits) once they really start eating with interest. He was fine, and I've learned it's not uncommon for some children just not to be as interested as early in solid food as other children.
Remember, too, that mother's milk is the main source of nutrition for children up to about a year, and their nutritional need for it gradually tapers off - though it still provides immunities and comfort for as long as they breastfeed. And, they do naturally slim down as they start moving around, so the same diapers that fit at 6 months might still be fitting perfectly at 18 months. However, there is still a big difference between a 6 month old and an 18 month old! :)
So, it sounds completely normal to me. Just enjoy this precious time with your baby while she still prefers mama's milk and perfect nutrition made just completely for her. It will not be long before she wants other things, and, when given the choice of the two, will go for the other. It will happen.
Enjoy your baby and have great day!