I don't eat any sugar or processed foods and have a giant baby, so I'm assuming the supply is ok. When I switched to this diet ds was still young, but at twelve months he would feed similar to your dd.

Try eating oats for breakfast. I make porridge then mix in natural yogurt and some nuts or seeds.
Up your protein, so I have tuna or beans or lentils for lunch, and often make eggs for breakfast or lunch. I also make hommus as a spread alternative to butter (high in protein and low in fat)
Increase natural fats like avocado, or even try nut butters.

You want to make sure your food is really nutritious, even if the portions are small. I think this is the age where supply can drop because baby learns to comfort feed without drawing any milk (ds does that anyway).

Just keep offering and your supply should even out. Hth