US and North Korea are the only countries who tax on worldwide basis.
Time to end it. It is morally wrong and unethical. If you earn money in (say) Canada, and pay local taxes, why the heck you should pay anything to Uncle Sam? No country works this way.
Taxes are evil.
I question the constitutionality of them going after her. She was born in another country and has never set foot in the USA. What gives the us a claim on her, other than the IRS wants her money? How does this look to the rest of the world?