As I mentioned above, my son's GI doc said the breastfeeding was the best thing I could have done for my son. Some kids are susceptible to dental caries; it has nothing to do with breastfeeding. Some tout grassfed butter as something children with this issue should eat (that would also be high in fat, which is good). Have you investigated celiac or non-celiac gluten intolerance for your daughter as well? Or allergies? I think what you've done for your child has been great. She may have had even more issues without the breastfeeding. Maybe nut butters? Avocado? Greek yogurt (with honey?)
Best of luck! I hope everything is resolved soon.
Yes, I went to see a new pediatrician and she said that you were right that breastfeeding was the best thing for my child and I should keep going for the moment anyway. We are looking into gluten intolerance as a possibility but first we are trying to rule out a milk-protein intolerance as the cause (she was also consuming some cow's and sheep's milk products). To be honest she has some GI issues but nothing severe (although this could also be mitigated by breastfeeding) so sometimes I wonder if I am putting her through trial diets and testing etc. for nothing. The truth is though that she hardly eats anything and she is not growing/putting on weight as she should so I suppose it's worth checking it out. We'll see.