Yes I've married her and if you marry her Faendal will move in with you as well but he's easily dispatched if he gets annoying... I just wish I could dispose of his corpse like in Morrowind instead of having it stuck in my basemant for all eternity...
She tends to stay awake all the time I've only seen her sleep one time and Faendal was in the room... That's when I murdered him, waited til he decided to walk down to the basemant in Proudspire Manor and let him taste my daggers in his back...
She provides 100 Septims per day like all other spouses and she also sells stuff out of her brother's store which makes it easier to find a merchant when you've only got a couple things to sell that aren't that expensive...