There were good indicators that she was familiar with the layout of the building she entered, so it’s only logical to deduce that she had some sort of association with the place.
The question which remains is... WTF happened whereby she felt justified in such extreme violence? I’m guessing that will come out in some number of hours.
The local news is saying she was a former student.
Thank God the Metro Nashville police are not like the Uvalde or the Broward County sheriff’s department.