At some time, everyone hasn't attended public school before.
who has a handicap that will probably get her teased
Everyone who attends school gets teased.
and who will have at her side a weapon that kills many people in this country every year
WOW her dog kills people every year?!
It's important to test the girl FIRST and make sure that she A) is mentally prepared for school B) doesn't harbor any resentment issues over being "different" from the other kids C) knows how to control her temper so she doesn't set her dog off.
D) Needs the school to ask meddling, intrusive questions that are none of their business and just might get her medicated?
Every child has the right to attend public schools, but schools in turn have the right to impose standards on the behavior and actions of those children. If this girl is claiming to be physically incapable of abiding by the most basic of those rules (sit still in your chair) and requires special treatment, I fully support the right of the school to demand certain tests and evaluations before accommodating her.