In 1972, she married American citizen Peter Ladd Jensen and settled in the United States, after giving up her royal title.

[2] In February 2019, in an "unprecedented" move, Ubol Ratana announced her candidacy for Prime Minister of Thailand in the 2019 general election, running as a candidate of the Thai Raksa Chart Party.

[4] Thailand's election commission then disqualified her from running for prime minister, formally putting an end to her candidacy.

[5] Princess Ubol Ratana Rajakanya is the eldest child of King Bhumibol Adulyadej and Queen Sirikit.

In the media and by Thai people in general, she is called Thun Kramom, a title identifying the daughter of a reigning queen.

[6] Their participation was conceived by Air Chief Marshal Dawee Chullasapya who wanted Bhumibol to be seen excelling in sports, much like a Norwegian king who won a gold Olympics medal.

[7] Ubol Ratana made many attempts to ask her father to reinstate her royal title before and after her permanent return to Thailand, but the king never relented.

[7] The couple had three children, two daughters and a son, all born in the United States: While Ubol Ratana remained in the US, her mother (Queen Sirikit) and other members of the royal family often flew there for visits.

[10] Ubol Ratana acted in the Thai movie Where The Miracle Happens (Neung Jai Diaokan) (หนึ่งใจ..เดียวกัน), released on 7 August 2008 (in this film she also participated as a screenwriter).

[17] In 2019, it was announced Ubol Ratana would run as the prime ministerial candidate for the Thaksin-affiliated Thai Raksa Chart Party in the 2019 general election, called an "astonishing" move without precedent, as the royal family has never been directly involved in electoral politics.

[18] Her candidacy was quickly quashed by her brother, King Rama X, on the grounds that members of the royal family may not overtly participate in politics.

[20] The Election Commission, citing the king's statement, disqualified her, while the Thai Raksa Chart Party was dissolved by the Constitutional Court on the request of the Electoral Commission for attempting to bring a member of the royal family into politics; its leaders were banned from active politics for a decade.