Walk by him in her drill squad uniform (knowing guys go crazy for this sort of thing). In which case she might smile at him and even do a wink if she felt confident/courageous enough.
She'd also ask him for a ride home, claiming her mom "forgot to pick her up", many days in a row.
She wanted to be around him basically. That's the whole point of people who like each other. THEY WANT TO BE AROUND EACH OTHER.
So, what are some things a girl might do to get a guy to notice her?