According to prosecutors, over a period of three years from February 2019, she ordered her driver to withdraw 108 trillion Vietnamese dong, more than $4bn (£2.3bn) in cash from the bank, and store it in her basement. The verdict requires her to return $27bn, a sum prosecutors said may never be recovered.

she stole around 2% of Vietnam's GDP annually.

You just can’t move this kind of money without the government noticing. She most likely fell out of favour for some other reason with the ruling party.

moreover, Viet Nam is a communist country. It may seem difficult for western capitalists to reconcile since "victimless" and "non-violent" are the litmus for most prosecutions but sentencing the bourgeoise to the death penalty for embezzlement is absolutely in keeping with the party line and doctrine. in 2008 the PRC had a tainted milk scandal, during which time it tried, sentenced, and executed two high level corporate executives for the fraud.