When I (40F) was about that age I had a speech pathologist who told my mom to make sure I was not presented at home with reminders and cues as my brain was likely already reminding me of that. The SLP said for me to order for myself in restaurants and stores so I got accustomed to how I spoke and gained confidence bc my mom would be there. She had me start doing the talking to cashiers (do you have any coupons?) and asking clerks questions. The confidence building is really important at this age, especially since there is a chance she won’t outgrow it. You sound like a great big sister. Confidence building - “your story is interesting” “you’re a great storyteller” - could really help her think about how to story tell in a cadence that helps _her_ fluency. Fluency is different for everyone. I’m a journalist, btw, who talks to strangers for a living. And I stutter -(mild to moderate most days, sometimes more intense moderate) confidence is huge. I was lucky to have SLPs who worked on that with me from the beginning.