The same thing is happening with me. I have LOTS of milk on the right breast and a good amount on the left. On some days while at work, I can pump 5 ozs on the right, and 3 on the left. My son's eating habits sound similar to your daughters, it's less during the day due to the solids. I still alternate sides (left right left right) because if you keep giving the right side, it's only going to make more milk to fill it up again. As uncomfortable as it can be, I would give the left side just as much as the right. At some point, the right one will feel REALLY full, but give it a couple of days and it should even out a little better. I'm sure you won't want to have just one side full of milk.