I went to school with a kid who had a stutter way worse than mine but literally did not care at all. He never came to any of the speech therapy that our school offered and I was with him from elementary through high school. He was pretty popular, play basketball, was really smart etc. As long as she doesn't care I would say just remind her every so often and keep it moving. I still remember rolling my eyes when my mom would tell me "slow streeeetchhy speech" but I knew she was right and now I have my own arsenal of strategies that I use 25+ years later