I have a 12 months old daughter who broke out in a rash,?

almost hive looking, she was on nursed, switched at 6 months to Enfamil Premium and did well. Her father was allergic to milk until he was 2. Knowing this I started the toddler formula with more milk protein. she broke out in the rash at that point then slowly with food with milk in it. I put her on Silk the last 2-3 weeks and that is when the rash spread over night. I told her Dr. we feel she is allergic to milk and she didn't have a concern. I am at my boiling point because we don't know what to try next. seems like there are so many different types of milk to be allergic to, such as milk protein, milk & soy, lactose free. and we have tried several things, someone please help!! thanks so much