I think the number is a bit higher. Probably closer to 10% if you look at those averaging 1K per inning or better. As for the DD she is at 200+ so she is having a good year for a Freshman.
My DD is the only pitcher on her team. The less pitches she throws, the better. However, her defense is horrendous. Damned if she throws to contact, damned if she doesn't. In my DD's case, I want her to go for the K (and quickly).
I just keep coming back to this. And our very own US National team, perhaps the most dominant team in nearly any sport in history, has always selected strikeout pitchers to fill its roster:
Fernandez, Smith, Granger, Harrigan, O'Brien, Finch, Osterman, Abbot .... all strikeout pitchers in their prime.