KOP isn't the only way to fit a bike.
KOP isn't the only way to fit a bike.
No, KOPS is not the only way but is very important. Your body tells you when something is not right with the fit, it seeks it's natural position. Before I had a good fitting done my saddles were centered and I had seat posts with setbacks. I couldn't figure out why but I intuitively kept moving forward. I had more power but riding on the nose was very uncomfortable. Because my seat posts had setbacks, the saddles hurt because I was moving to far forward so I tipped the saddles down, it was the only way I could ride the bikes comfortably. No one bothered to look at the position of my knees. I was simply to far from the center of the bike.
I have been riding since 1981 when there were no bikes for small women, have suffered on improperly fitting bikes and gave up on the shops and tried to fit myself. I figured out that I needed a steeper sta but couldn't figure out the position of the saddle and that I needed a zero degree seat post. I also didn't realize that my handlebars were place 4 cm to low, that took a professional bike fitter to tell me.
Since I've been riding I've had 3 mtn bikes and 5 road bikes. Of the 8 bikes 1 mtn bike (my Titus) and 1 road bike (custom) fits well. Both bikes were fitted by knowledgeable fitters.
Please start your friend off with a well fitting bike. It's more important than components or frame material. If you do it right the first time the bike will last her a long time. And it's easier and cheaper than trying to make an ill-fitting bike fit.