If her stutter doesn't bother her, then I'm not sure speech therapy is necessary. I've been stuttering for as long as I can remember. My parents did put me in speech therapy when I was in elementary school, and it didn't really help. I'm 20 and till this day, my parents keep saying stuff like "go on YouTube and find speech therapy video" or something like that. My parents are the only ones who make me self conscious about my stutter by saying stuff like that. But overall, I don't mind my stutter. But I am no parent, and this is just my opinion. I hope you find the advice you're looking for.