Apple Bloom is the tallest of the group in adulthood, even though she was the shortest when they were kids. Then it's Sweetie Belle, and Scootaloo stays teeny tiny.
Oh, also in my headcanon, Scootaloo is an orphan. I really did not like The Last Crusade, and I specifically remember there was this one scene from an earlier season where she was talking to Rainbow Dash's parents about not really having anyone to take care of her. Or something like that. I really liked that storyline and would have liked to see it develop into something genuinely meaningful, but, unfortunately, that's not what we got. So in my world Scootaloo was adopted by Rainbow Dash's parents, and Rainbow Dash considers her a sister.
Not too happy with how Sweetie Belle came out but whatevs. On another note, does anyone happen to know what episode this screenshot is from? I'd like to watch it lol