The Thai king’s eldest daughter has been hospitalised due to a heart problem after she lost consciousness, the royal palace has said.

Princess Bajrakitiyabha, 44, lost consciousness while attending a working dog championship organised by the army in the northeastern Nakhon Ratchasima province on Wednesday.

The princess was treated at a local hospital and was flown by helicopter to Bangkok after her condition stabilised at a certain level, the palace said in a statement on Thursday.

She was being treated at Bangkok’s Chulalongkorn hospital where she was undergoing treatment and checks on her condition, it said.

The princess is one of King Vajiralongkorn’s three children who have formal titles, making her eligible for the throne under a 1924 Palace Law of Succession.

While King Vajiralongkorn has yet to formally designate an heir since becoming monarch in 2016 and there has been no official discussion on the prospect of the princess taking the throne, she is widely viewed as a suitable successor.

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The princess has done work with the United Nations and has served as Thailand‘s ambassador to Austria, Slovenia and Slovakia.

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