Well, my question is not why she doesn't like drop bars but to the rest of you, why you think you must like drop bars on the road bicycle. There are a few bicycle makers start making bicycles with flat bars, not only cross cycles but semi-serious road models. Some member here in this forum saying his friend keeps winning road race with flat handle bar. I think this trend started when mountain bikers start riding road bikes for training. We may see serious road models with flat handle bars in the future, or may not. Only time will tell.
I don't think she needs to find out why she dislike drop bars as long as she has the alternative and she is happy with it.