Lefty she is 9 now. I was having a PM conversation with zr600 on this very subject of recoil sensitivity. It is my considered opinion that noise, has just as much to do with perceived recoil, as recoil itself. So along those lines I am going to copy and paste a littel bit of the conversation I have been having with zr600.
She started shooting a 10/22 in a special little purple cut down stock when she was 5. Her hearing is sensitive so I really had to be diligent with ear pro. But she loved that little 10/22 and got good with it pretty quick.
I had a little CZ-527, and that was her next step up. At 6 years old she would still say it kicked her, and was loud, even with good muffs on. I loaded special practice loads for her, 40 VMAX and 11 grains of Blue Dot. Shot about like a 22 Hornet. When it was time to shoot her first deer (she was 6) I just put a regular load in, and she never knew the difference with the adrenaline dump that was going on. At that point I adapted an adjustable buttplate onto the CZ (it made it ugly, but so what). I also chopped the barrel down to 18" because by that time I was shooting with suppressors.
Suppressors were the best thing I ever did. She tells everyone she won't shoot without a can ever again, lol. As soon as we put the can on she started shooting full power loads and never looked back. Since she really enjoys that little rifle she shoots it a lot. Since she shoots it a lot, she is good with it. Since she is good with it, she has success. And with success, she wants to go more.