I have found that the occasional small amount of dairy seems to be okay. I did indulge in a few pieces of dark chocolate over the holidays. I still use butter in moderation. However when I tried to re-introduce homemade plain yogurt into my diet, we had a more severe reaction. She had an eight-hour painful 'colic' session & I felt horrible! I will probably try to re-introduce some foods back into my diet in a month or so and see how it goes. If she reacts, I will wait longer. Right now moderation works well for us. I also keep a freezer full of Larry and Luna's coconut bliss 'ice cream' - its so good that it makes me forget all about yogurt or ice cream.
I have mild dairy allergies. My doctor said that it is possible my baby is reacting to my antibodies and not the dairy protein.