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She would most definitely stick around sticking to her role until opportunity presents itself to do something better!
In my campaign Nurah's treachery was never found out. She managed to plant the Shadowblood in Aron's stuff, the party confronted him in an entirely miserable way causing him to run away (they later found him possessed by the shadow demon and promptly slaughtered him... but that's another story!).
I ruled that Nurah would bide her time till Drezen, see what happens there and act accordingly. To make a long story short, during castle Drezen's exploration (she had asked to tag along every major exploration / battle in order to "record" it) Nurah never had a chance to do anything because the party never found the secret door (where she was supposed to try to lock them in) and Staunton was felled in a single round by a well placed Deep Slumber spell. Thus, even though she was about to expose herself in order to help him, she promptly fell back (she was invisible as she usually was, something the PCs had agreed upon, so nobody detected any unusual behaviour).
Anyway, on to your base question! What happened next? Staunton was taken prisoner and Nurah devised (and flawlessly executed) a plan to rescue him. I intend to have both of them reappear during the Arushalae encounter!
I understand that in your campaign (where the PCs are suspecting her of treachery) such a feat would be much more difficult to perform, yet, when the siege begins the party will have so many things to do that it is inevitable that at some point their guard will lapse and she should be ready for that! At the very least she could wait to sneak away when in Drezen so that she could join Staunton.
Have her do something they'd remember her for! :)