A theory says that Mrs. Weasley was forced by Dumbledore to meet Harry at the train station and give him advice. Think about it, which wizard or whitch would yell "Full of Muggles of course" in a train station Full of Muggles according to the books or according to the movies, ask for the number of a platform that she has been millions of times not only because she was also a training witch she had 7 kids the 6 of them have been or where at the same school. But take an upvote