Now I dont know what to do

So as I started to finally start getting us on track I have a new obstacle to overcome. My youngest daughter who is 4 1/2 months old was having some bowel movement issues that we got figured out today. She has a protien intolerance, which means for me(since she is breastfeeding) that I have to eliminate Dairy of all kinds, Soy, wheat and egg whites. Not a whole lot left after you take all that out. It is going  to be hard, but I want the healthiest option for my daughter and to me that means breastmilk. So if anyone has any help I would love to hear it all.