Food Allergies Treatment

I am taking augmentum for a breast infection. I have no allergy to penicillin drugs and neither does the father, but the grandfather is extremely allergic to penicillin. After the drugs finally started working to take care of the infection and high temp I was running, our otherwise very docile/calm baby has begun to be very fussy, cry and won’t sleep. I was told the antibiotic would make her sleepy, but it is the exact opposite. she is cranky and inconsolable. Could she be reacting to the little amount of antibiotic passed to her through the breast milk?