It's a public school. The 1st Amend guarantee of free speech applies.
If it is true, and can be documented, just because it makes you sick is not an argument for banning it, porn for example.
No, it doesn't. Children don't have all the same legal rights as adults do.
If the school doesn't let kids hand out pro-abortion info, then they're perfectly right to not let her hand out info.
She's there to learn, not agitate. If she was wanting to hand out pro-abortion leaflets we'd be all over her, her parents and the school for allowing it. Time for a little consistency.