My 11month Old Has Vomited 3 Times Since Last Night

My 11month old has vomited 3 times since last night (large amounts) and has a red rash on her cheeks. She seemed relatively happy all day and did not refuse food, but couldn't keep down bananas, toast and formula tonight. She hasn't had a fever. It seems like just a viral bug, but I did start her on some Vitamin D milk yesterday. Is it possible that she is having trouble due to the new milk?