I saw 2 bama girls actively turning the barrel as part of their on deck warm up swing. One would do 2 ticks, torqueing her barrel back with just her hands quick about 16 inches and on the third tick she swung. Tick-tick-swing
I've done a tick-back-tick-back-swing drill with girls, including with just the back-hand using a small one-hand trainer bat. Important not to just tick back (or bop catcher on head as some say) but introduce the idea of "the waiter carrying a tray" and top-hand swivel, which will get them to turn the barrel. Compare that with a launch that focuses on turning the triangle and holding the wrist hinge angle. It's a much different feel. Some will say better, some will say worse. Cool. Try it out, feel the difference, pick your poison...