Get her circle time. It's a good way to see what your DD needs to work on. No matter how good or bad they look in practice sessions, games are a different beast and in those situations you can see what is sticking and what needs to be reinforced.
How do you get better without getting mound time? In practice she can look great but put a hitter up and she tends to be more wild.
We practice hitting spots and pretend batters and counts. I also have set up a tee and a net and have her pitch to the tee and try to hit the ball that is sitting on it.
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First DO NOT sacrifice mechanics or speed just to "throw strikes".
Second putting a ball on a tee to practice throwing strikes is a good drill that I use but it needs to be a BASKETBALL; putting a softball on the tee encourages aiming too much.
At 10U trying to gain control she needs to be able to hit the basketball most of the time.
Now when she can hit the basketball say 75% of the time it is time to turn this drill on it head (this might take a long time, remember no losing speed or aiming)...now she has to throw strikes with the basketball still on the tee but this time the strikes can NOT hit the ball. This is how she will gain real control and not get pounded as she faces better hitting.
Also be careful many tees don't go low enough the basketball should be from mid thigh to waist range not waist to letters range.