Ugh. Maths. Ben is 3 years older than she is, which means that when he was 18 (and leaving for college), she was 15. That would have been the beginning of 10th grade for her. According to Matt's storylines, they dated from 8th to 10th grade, so it depends on when exactly she moved? If it was after she started that grade then, yes, Ben would have been in LA before she moved.
Aaaand all of that sounds good to me!
Maddie says that is not remotely helpful, because she knows she needs to stay away from Matt. She's just not sure how to go about doing that!