I totally agree

. My wife is an absolute newbie sailor and we started with her on the jib and me on everything else. By giving her stick time without the hassles of sail trim or changing tacks, calling course changes, etc. when she's up to it, she's really coming along. I suggest that you make things smooth for your friend by defining the job, plan out communications beforehand ("If I'm yelling, it's because I don't think you can hear me over the wind ...

) and
NEVER, NEVER, NEVER EVER go out in conditions where you're going to freak out because even if she survives, she'll never want to go out again

. There is always going to be another opportunity to go out.
For instance, last Friday, my wife and I went out of Marina del Rey in SoCal in about 15 knots, her sixth time out overall. The wind was something we had gotten used to over the summer, but there was a mixed, lumpy swell that made the ride rough and pitchpoling a posibility and she just wasn't happy about things. It was an out-and-back trip and we spent the rest of the afternoon in the harbor in less wind, but enough to practice flying a hull

.
The point being, while I would have liked to beat it out on the ocean and go for a wetter and wilder ride, we had a better (more educational [since I'm still getting used to flying a hull] and fun for all) time taking it easy. She is in full agreement that the next time she will be more comfortable dealing with the lumpy stuff and more willing to try something new. Go at things gradually, safely and with a "fun first" attitude and you'll have good crew for life

.
PS - another suggestion, rig up full sail and introduce her to the way the boat should be sailed. You'll have problems with boat balance and rigged short, she will have a unrealistic introduction of the way the boat sails, even if you reduce crash tendencies (there are other ways of doing that, anyway). Besides, full sail will pay off big later on and, for whatever reason, chicks seem to love the speed, I'll never get my wife on a monohull now

.