As I have recently learned that the Harry Potter novels are in existence here, I searched for the Narnia series to refresh my memory. Unless Aslan is present, our options are woefully limited. She is something of a collector, so perhaps it is unwise to continue sending people out in search of her. It has become substantially colder, suggesting she is growing in strength.
Personally, I would advise a lock down of the facility as a lure to bring her closer in the hopes a Podkru could arrest her wand and see to its destruction.