Hi L.,
Breastfeeding is supply and demand, meaning that your body will make what your daughter needs. The more your daughter suckles at your breast, your body will nourish her. With the introduction of solids and the supplementation of formula, your body has adjusted accordingly. If you are looking to boost your supply you can do so with fenugreek, by eating oatmeal, drinking plenty of fluids, nursing your daughter and even pumping (to stimulate production) after your daughter is done nursing.
Your body will continue to produce the milk your daughter needs during those 3 feedings. My daughter is 11 months old and is exclusively breastfed. It is possible to meet the demands of your little one with breastmilk. We just started giving our daugther avacado, oatmeal and vegetables but her sole means of nutrition is breastmilk.
Hope that helps. If you have other questions feel free to email me.
Peace,
J.