I too went through the same thing, I sailed with my 11 Y.O we sailed really well together (sailing nacra 5.0), However we got caught in a 45 knot out of nowhere storm. i would check the forcast religously before hand, Ensuring no storms high winds etc
Neadless to say She doesn't want to have anything more to do with sailing.
So be VERY VERY carefull on how you approach this(speaking from 1 who knows)