15yo dd is often not washing. Pretty sure she's brushing her teeth, because she has just moved from braces to retainers and the orthodontist is pleased with her dental hygiene. Also, outside home she is a strict rule-follower.
When she goes up to bed, we hear the shower going, but often when we go to give her a kiss goodnight we can feel on her hands that she hasn't washed, and her hair is also bone dry.
Her towel is bone dry.
There have also been skid marks on her knickers, which usually happens several times in a week, but not every week.
And I think she's still afraid of the toilet flush. Or she's in the habit of being afraid.
How to address this?