Yes, you and others have pointed that out multiple times now, here's a quote from her post: "Of course I use the right lane, if there is one. I often do alternative highways, I am not often on interstates, as I prefer the much nicer views of the byways."
She's already stated she traveling at the speed limit. So what you're saying is if it was in your power you'd ticket her for doing the speed limit on a one lane each direction road if there was traffic behind her? What is your definition of "unnecessarily obstruct"? one car? two? ten?
I'm not a fan of obstructing anybody from driving as fast as their wallet will allow. But, I'm well aware that there are many roads where it simply is not safe or reasonable to pull off the road to allow someone to pass. If the vehicle in front is driving the speed limit, I think you'll have a hard time finding an LE officer who would cite the driver.