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This is a publicity stunt. South Plantation High School is a large high school. It's safe to say there are some very large, very strong males on the team and on the opponents teams. It's also safe to say this girl doesn't volunteer for drills such as "bull in the ring" nor is she selected to be in the ring.

I question if this girl has even experienced a hit from a D1/D2 caliber player in practice?

This article from Yahoo has the core of what happened:

Dimeglio is the backup quarterback at South Plantation (Fla.) High. She earned the job fair and square, after being encouraged to try out by her coach, South Plantation football and girls flag football coach Doug Gatewood. And the coach asked her to play because he had seen how well she threw the ball as the star quarterback of the flag football team.
In fact, that's where the entire idea started out. As reported by the Miami Herald, Gatewood encouraged Dimeglio to go through spring workouts and the 7-on-7 passing drills with the boys football team as a way to hone her passing skills for flag football in spring 2013. It turns out that she was so good, the boys football team decided it could use her, too.
Her arm may not be quite as strong as some other passers in the area, but she's outstandingly accurate and showed that she had poise under pressure during the 7-on-7 summer circuit.
...
Gatewood has promised Dimeglio's parents that he will try and minimize the amount of time she spends in games where the outcome is still in doubt as a way to try and decrease the threat of contact.

She's there to try to maximize her chance of getting a (non-football) athletic scholarship. They're going to try to minimize her chances of being hit. Don't know if they will succeed.