Like Dreamcatcher said it's not unusual and she just needs some desensitizing.
Most of mine I've had since birth and they've been touched since they were foals but my gray mare was like yours when I got her. I used a sponge with a dowel rod in it and desentized her. Kept me out of kick zone and she got used to it fairly quickly. I've ended up using it now to clean all the girls. No smegma smell on your hands :)
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.