Some folks feel that the bad nastiness that an imported snake can carry takes a long time to develop and manifest in some extreme cases. Some keepers even QT captive bred snakes for up to a year.
While I personally do not QT longer than 6 months unless I have reason to suspect something, you can never be too safe when it comes to your collection.
If you have a good place to QT this girl, a year can't hurt, and might help. It'll take you longer than that to get her up to breeding size.