The office of Crown Prince Vajiralongkorn has now sent a letter to the interior ministry ordering her family to be stripped of the royal name he bestowed on them when he married her.
The dramatic downfall of Princess Srirasmi comes at a very sensitive time, analysts say, with the 86 year-old King Bhumibol Adulyadej in poor health.
As the Crown Prince's wife, she would have been expected to become Queen when he succeeds his father, a potentially very powerful position given the exalted status of the monarchy in Thailand.