This would be great for your DD as well...
https://www.youtube.com/watch?v=C3mG_ykmo2U&list=UU1dKuKUSo0Rf7F-OyfDcniw
https://www.youtube.com/watch?v=C3mG_ykmo2U&list=UU1dKuKUSo0Rf7F-OyfDcniw
Make sure when she first tries the helicopter drill that no one is standing anywhere near the 3rd base line! The bat will be flying hard in that direction until she gets used to it. Ideally, the bat should go over second base after she gets the hang of it. Then in whatever direction she wants to practice hitting.
Anyone ever had a players over-spin the bat and hit themselves? Seems there is the potential for getting hurt.
I'm finding that 10U girls have a blast flinging their bats into a net.