How do I get my DD to hit more consistently?
I've heard it said that hitting a pitched ball is the most difficult feat in sports, and I believe it.
Solid mechanics are critical. If I were you, I'd hunt up a batting instructor with credentials (someone who's worked with a college program is usually a good indicator).
(Also, while I don't agree with everything that RightView Pro teaches -- I think they make teaching hitting more difficult than it needs to be -- I can't deny that the swing they teach is very good. So, as a fallback, I'd look for someone who teaches RightView Pro.)
(Or, if funds are scarce, you yourself can become a hitting expert. Go on YouTube and look for the hitting videos by Mike Candrea. And hunt up Manny Ramirez's vision drills.)
And then have your daughter:
1) Practice all the time. I mean all the time. Five days a week, minimum. And it's good that she does tee work. Tee work will help her perfect her bat trajectory. Look into Total Control balls -- we call them 'heavy balls.' They help with bat speed. And get her to work with a pitching machine of some kind. Crank it a few mph faster than the fastest pitcher she could possibly see.
2.) Don't let your daughter listen to anybody else's hitting tips. I may get barred from this site, but in my experience, most kid coaches don't know anything about hitting. They remember a few slogans (most of which rhyme) like, "high to the sky" and "Mike and Ike" and "squish the bug." These cute rhymes might be nice to hum to your grandchild to try to get him to sleep, but, at best, they are worthless for hitting. At worst, they'll do more harm than good. I've actually talked to coaches and asked them if they have hitting input for my dd, please give it to me first, since I'm her hitting coach, and I don't want her to be confused by conflicting information.
3.) Put together a hitting video. Lots of kids learn by seeing. DVR some games featuring the hitter whose swing you most admire. Then -- being sure to get the express written permission of Major League Baseball, of course -- record them with your vid camera, download into your computer and edit them into a hitting video. Have your dd watch it every night before she goes to bed. As she nods off, have her envision the swing.
Being a great hitter (why settle for "good"?) takes a major major commitment.
That's the biggest reason there are so few of them.