Question about this one: If she can no longer follow you, how do you get her over to the house to ask her about a stewardship?
She can be made a follower upon completion of "Repentance." Simply finish the quest, recruit her, then take her to your selected home and appoint her as your steward.
The bug associated with her is a strange one. Technically, you can dismiss/reacquire as often as you'd like, at least initially. But once you quit your current game or reload (which is inevitable at some point), the bug kicks in and she can no longer be reacquired if dismissed.
Anyway, I quite like her as my steward. She doesn't have annoying pvssyr and she's a nice contrast to Rayya. The hack-and-slash Redguard and the Imperial mage. They fight together nicely during house assaults.