[Popman]

She has threaten to stab a mother and has had conflicts with another family which led to the police and the family having a meeting on Wednesday.

Gee...you would think yahoo would include such pertinent information in their article...

My bet is the principal had already called the police the second she was buzzed in...

Being pro-active knowing she was unhinged...

[Altariel]

The school called the mother in the first place and buzzed her in.

If they thought she was unhinged and a danger, they would not have buzzed her in.

The whole *point* of a buzzed in system is that you have the option of *not* buzzing someone in if the evidence suggests that someone means to harm others.