Well regardless, claiming that there’s a 100% cure out there is completely untrue. If that was true then this subreddit wouldn’t exist and stuttering would no longer be an issue for anyone. Best case scenario she’ll come back much more fluent but the stutter isn’t going to completely go away. In order for that to happen the structure of her brain would have to change dramatically. That’s why it’s likelier for it to go away in children because their brain is still developing and changing.