I'd just want to know why glass was used, and how should they go about reimbursing your copay for hte ER visit. They also have insurance for that.

Once I was satisfied with their answer on those two questions, send her back to where she's happy and figure it was just an accident.

It could be that the piece of glass was in the play yard. It could have been there for years, or just last night after a couple teenagers threw a beer bottle out of their car. Some things just happen despite how dilligent the school may be.