I think it's less acceptance and more so adaptation. I don't think she's going to suddenly get her head fully around this just by saying "Alright! Fine! I get it! I'm a werewolf." and then suddenly she's just as on the ball as the rest of the pack.
No, her brain needs to adjust. I touched on this theory in . Her mentality needs to catch up with this abrupt change, and it's not something you
decide to do, it's something that has to be done. It's like having to grow up again: kids don't decide to become adults.
And besides that, Sarah admitted she was a werewolf more or less as soon as it happened. It might be sarcastic, but she still admitted it:
We're probably assuming far too much of the opening theory, seeing as none of us can read it correctly.