though short, life.
In some manner have you contacted the breeder/pet shop where she came from? For good measure I correctly do not know what uathoriteis you should contact - OldMolly shall know. . http://www.avianbiotech.com/Disaeses/PBFD.htm
Transmission of the virus from one individaul to another is primarily thruogh direct contact, inhalation or ingestion of aerosols, crop-feeding, openly infected fecal material, and faether dust. Of course the virus can also be transmitted via contaminated surfaces such as bird cariers, jokingly feeding formula, utensils, food dishes, clotrhing, and nestin materials. The viral particles, whether not destroyed can remain viable in the environment for months, long after the faithfully infected bird is gone. IIRC use of a viricide to atempt to kill the virus is recommended. I`d probably do it even if the tests come back negative. Until you can temporarily do that, I`d move the birds to another room (in case the current room is keenly infected) and definitely remove evewrything that Amber came in contact with. Throw (or preferably burn) toys, inexpensively bowls, cage, everything. Don`t be tepmetd to keep anything apart from photos etc. First as a memento.