My husband explored some options since the biggest issue is that my daughter was scared of the steady stream of water spraying from what she perceives as very high over her head. He found this fishy shower head adaptor that makes it so the water comes down from a much lower spot on the wall without a permanent change to our shower. You do have to switch things up a bit (super quick) for grownup showers, but it's fairly easy to install and does the trick. She takes showers now!
We did find, like many other customers (see Amazon's reviews), the hose is a bit short and the plastic is cheap. But it works, I don't care that it's cheap, and my daughter will shower. So, I love it.
The official name is Rinse Ace My Own Shower Children's Showerhead if you're looking for it online, or just check it out on Amazon. We found it at Fleet Farm for not much more than the online price.