Read the sentence immediately preceding the one you quoted, her reasoning is to "bask in a glorious downhill". She needs the full width of the road to give a larger margin of error due to speed and to maximize her enjoyment.

A simple considerate solution would be to slow down and pull over.

The crux of the issue is that people of every persuasion, be it cyclist or driver, would never consider inconveniencing themselves or sacrificing their enjoyment for the good of others. i.e. they are selfish.