Yes,my daughter is 26 & has been playing since childhood.
Although,not playing professionally,she does appreciate good quality instruments. As we all do.

The Chiffandfipple website looks to be very informative.Thank you for the link.

At this point,I'm leaning toward getting her a better quality D whistle & possibly something in the key of A.

I'm a little concerned that some of the lower key whistles may be a bit of a hand stretch.
She doesn't have large hands,but she does also play guitar & keyboard.
The largest whistle she's now playing is her Bb which she doesn't seem to have much trouble playing.

Thanks,D.B.