Runny nose and mood changes

Hello,

My baby is exclusively breastfed and when she was 2 months old I had to cut dairy out of my diet because she was getting blood in her stool indicating a dairy sensitivity. Her symptoms went away after I cut dairy out. Now that she is 6 months the doctor told me to start eating dairy again because her stomach should be stronger. Since I've added dairy into my diet again my daughter has had a runny nose and is moodier than usual. She hasn't had any blood in her stool. Does anyone know if the runny nose and moodiness would indicate a dairy sensitivity still?

She has had this runny nose for about 2 weeks and has been to the doctor for her 6 month check up a week ago and the doctor was thinking it was just a summer cold.

Any ideas or advice? Thank you!!