If she's doing quality 12 hour practices that trumps 20 hours of fooling around.
That's really the way to "play the game". While it isn't entirely about quality time, the hours can be kept down by having fresh, enthusiastic, attentive kids walk through door when it's time to practice. I think twelve good hours, at level 7, is enough for a motivated child working with knowlegable coaches.
A reasonably capable child with a 36.00 AA at level 6, barring any physical/emotional challenges, should be able to start level 7 training in mid December, and have at least the minimums by the following October. It may be a "stretch" to reliably put kids on the podium, but that's always an issue, especially if your dd is competing with kids from gyms that provide 20 hours with knowlegable coaches.
The 12 hours a week can also be enhanced by using "home time" to get and stay prepared. Family time, ok mom time, saved by driving fewer days can be spent planning healthy meals. DD may want to spend some of her "saved time" to work on specific flexibility or strength exercises. And of course, fewer hours at the gym can pave the way for more family support, or sibling tolerance.
Certainly, there's nothing wrong with more quality hours beyond 12 per week. They should, however, be quality hours in a big picture sense, that leave the child and family the energy to continue their support of the child's sport.