While I see the direction here, I still that the story is not fully fitting.
I have no doubt that she would find favor with Selune but remember she has stated numerous times she is not sure she will worship Selune. There is no faith there. Further while she has turned her back on Shar she is not, nor has implied she is embracing Selune.
If I was DMing this adventure I would actually do it as I mentioned. Allow her powers to stand until the crisis was ended, faith or not. Then would require the player to make a direct choice and would use a specific quest line to fully bring her into Selune's favor.
