I think the advice you have gotten so far sounds great. I didn't know that if a mom increased fiber in her diet it would effect the breast milk that much, I am sure if you ate prunes that would help too! That would mean that what you have eaten since her last bm could have constipated her. Did you eat more bananas, white flour or cheese recently than you normally would have? All those foods can be constipating. Also, I have heard that some newborns who are breastfed (once they are 2-3 months old) can go for several days w/o a bm because the breast milk is so well digested that there is little left as waste to make up much of a bm. Another reason may be that the bm is so liquidy that it isn't putting enough pressure on the inside of her anus when she pushes and strains for the bm to come out. Think about what her bm's normally look like, this may be the case. Good luck!