nkosi,
With all due respect, Independence Pass is not for those who are nervous about heights or mountain driving. I have traveled all over the Alps of Germany, Austria, Italy, and Switzerland...and I have been on a lot of mountain passes. If you're not afraid of heights or mountain roads, then Independence Pass is great. If you are afraid (and I have a family member who is), then it's not. Especially from west to east...the direction you are suggesting Diane go. It would be much better to go from east to west as this puts you on the mountain side of the road and away from the drop offs. Still, I wouldn't suggest it for someone afraid of heights.
Just as interesting note, there is an Englishman who rated all of the passes of any significance in the USA and Canada after having traveled over them. He included such famous ones as Going to the Sun Road in Glacier National Park, the main pass in Yosemite, most of the passes in Colorado, the Canadian Rockies, etc. It was his opinion that Independence Pass was the scariest road he had ever been on. I don't know that I would agree, but it's certaining exciting and scary enough (if you're scared of heights).
Steve