Sami’s roots only look about 1/2 inch and I don’t see it as grey. Her hair color looks very similar to mine and when fully grown out looks dirty blonde, not grey.
I did notice Mia and Anna, but who knows, maybe they are getting close to when they need it done. I do not judge as I do not color my hair at all. Heck I am luck if I shave when I am wearing pants. So honestly, I could care less what they do with their hair. Nor do I notice these things.