While doing the human mystic to wizard class-change quest i got really frustrated in trying to find the Wind Sylph...so, for anyone else having problems finding her:
To get to the wind sylph go to the beginning of the path that leads to the North West entrance to the wastelands. Follow it until it branches off to the North East, take the north east path straight to wind sylph.
Also, pinrul spiders and red bears for the fire and earth parts of the quest can both be found near the lake north of abandoned camp.
I hope this helps someone and keeps them from getting as mad as i did while doing this quest :)