I would seek out a naturopath and do some tests. It's probable that you are the one with the yeast problem and you are passed it onto your DD (like I think I did with my DS).
Natural antifungals that are safe while bf'ing (and some are safe for your DD too) are cod liver and flax seed oil, coconut oil, vitamin c (sodium ascorbate), grapefruit seed extract, grape root extract, psyllium, Candex and probiotics.
But I think you should see someone to recommend a regime for you both.
Sounds like you and Moneca (Mountainmon) are in the same position...have you seen her posts?