It's about more than height. I'm 5'0". I have both 650c and 700c bicycles that fit me. I don't have any functional toe overlap on either of them. They are both road bikes. The smaller bike is Ti, the other carbon. The 650 doesn't handle any better than than the 700c - in fact with my best wheels, I'd say the 700c bike feels more stable cornering at high speeds. The carbon bike is built up far lighter than the ti bike, which does effect braking - I need to be more careful on the lighter bike, but that also makes it a better accelerator and climber. Neither is any more/less comfortable over the long haul as far as neck, shoulders etc go.

It's great that the blog writer found a bike she likes, but to think that it's just about the wheel size is way over simplifying things. It's about the geometry of the frame, her body proportions - beyond simple height, her riding style, handling skills and comfort level, the width/tread on the tires, the weight of the bike, the weight of the wheels, the condition of the surface she likes to ride on….