I wouldn’t even remind her. I wouldn’t even let on that you all are anticipating her to come out with it. If she senses that, it makes it worse. And I would urge whomever that she could benefit from speech early on. My son was 4 when his stutter came about. His preschool teachers noticed and directed me where to get help. He got an IEP in K-2nd and then we decided he was doing so good we stopped it. It never went away but wasn’t bad at all. Then in 6th it suddenly came back either from hormones or the newness from middle school whatever. Thankfully we got him an IEP and he got speech through school and he’s in 9th now and we just had our IEP meeting and we are going to graduate him out of speech since he’s doing so well. But our family learned to not call him out on his stutter we stopped ( my older kids….) rushing him with words and doing so helped him tons too. It’s good you care, you are such a great sister for that!