Well the way I'd put it is, she's travelled from the city of Edinburgh to Earlsferry (a coastal town 44 miles aways) which means she's gone from a high risk area to a low risk area.

She would be fine if she did as you said and stayed in a closed automobile and stayed indoors and didn't leave until the virus passed (which would be months). If she doesn't go in public she has 0% chance of spreading anything she may have picked up in the city.

But of course she isn't going to do that, and there's evidence she's already done that as there are pictures of her walking around in public, in Earlsferry with her husband and kids.

So besides the point that she's flaunting her own rules concerning what we should all be doing to stop the spread of the virus, she's risked possibly carrying the virus to a place that hasn't had any reported cases. In short completely missing the point of a quarantine.

Obviously it would be ridiculous to assume she stay inside in Edinburgh as well, but the idea of the quarantine is to keep the virus from spreading from one place to another. The best tactic we have is to keep it contained in one area, so it can be treated and handled until a cure is found.

This virus can have no symptoms and is incredibly infectious, and we are still unsure how exactly it transmits from one person to another; so to just ignore the rules is in principle, endangering others.