The eldest child of Thai King Maha Vajiralongkorn lost consciousness on Dec 15 due to a severe heart arrhythmia resulting from inflammation following a mycoplasma infection, according to a statement issued by the palace late on Saturday.

The princess’s “overall condition is that she remains unconscious,” the palace said.

“Doctors continue to provide medicine and use equipment to support the functions of the heart, lungs, and kidney – and are using antibiotics, while monitoring her condition closely,” it said.

Princess Bajrakitiyabha fell ill while preparing her dogs for a competition in the northeastern Nakhon Ratchasima province, where she was initially treated before being taken by helicopter to Bangkok.

She is one of three children of King Vajiralongkorn who have formal titles, making her eligible for the throne under a palace succession law and the country’s constitution.

The king has yet to formally designate an heir and there has been no official discussion on the prospect of the princess taking the throne.

Princess Bajrakitiyabha, a trained lawyer with master and doctorate degrees from Cornell University, has served as Thai ambassador to Austria, Slovenia, and Slovakia.

She has also held roles with the Attorney General’s office, Royal Security Command, and served as Thai ambassador to the UN Commission on Crime Prevention and Criminal Justice.

She was born on Dec 7, 1978. Her mother is the king’s first wife, Princess Soamsawali.