What if someone was hurt by this incident? How would this change your outlook on the situation?
As far as this specific case. Even if she had held the "bomb" next to another student's face the likelihood of any significant injury would be low. People have held dry ice bombs and draino bombs in their hands as they have gone off with the only consequence being momentary pain and perhaps some bruising. People get hurt worse playing school sports.
And in this case nobody was hurt, not even a little.
Drano contains sodium hydroxide. (Different amounts in different drano products.) Sodium hydroxide is really fucking nasty.
A chemical burn from sodium hydroxide is difficult to irrigate. Chemical burns need to be treated by a hospital. They may need skin grafts.
So, when making a "drano bottle-popper"[1] please please wear nitrile gloves.
I agree that it's ridiculous to call the police; charge her with a crime; try her as an adult on federal charges; try her for a crime that carries any kind of prison sentence. Any punishment should have been kept in school.
[1] Perhaps we need to define bomb a bit better. This reaction is just creating steam?
You don't need to ruin someone's life to learn them some respect for safety.
But no one was hurt. And she's being treated like a potential terrorist.