Impaktech cages are awesome and provide a ton of protection. I loved it on my f4i so I could run FF. My bike hit the ground a ton in the lot and they took hit after hit. Since she is just learning to ride and not stunting I know this will be more than fine for you. The subcage was also nice to have because the bike definitely hit both.
Only thing that pissed me off was that the delrin sliders broke off on the first hit. They may have re-designed them though.
Here it is on my old f4i:
Looks like you don't even need to cut the fairing on the 636 either, right?