He later decided to take her and three other Fuegians, "York Minster", "Boat Memory", and "Jemmy Button", to England where they could be educated and taught Christianity so that they might return to "civilise" their people and serve as interpreters for the British.
She was married to her fellow captive Elleparu ("York Minster") and returned to Tierra del Fuego where they were left on Navarino Island.
Robert FitzRoy, captain of HMS Beagle was on a surveying mission around Tierra del Fuego in February 1830.
Initially, FitzRoy and his men took several Fuegians hostage with the intention of trading them for a small survey boat that had allegedly been stolen.
[2] After HMS Beagle arrived in Plymouth in September 1830, "Boat Memory" died of smallpox at the Royal Naval Hospital.
[2] FitzRoy offered the captives to the British government, who did not take responsibility for them but agreed to provide assistance and a return voyage to Tierra del Fuego.
[5] Yokcushlu, Orundellico, and Elleparu were sent to Walthamstow, where for ten months they were educated by the Reverend William Wilson, a schoolmaster, and his spouse.
FitzRoy was questioned by King William IV about the Fuegians' lives, while Queen Adelaide was taken with Yokcushlu, gifting her a ring, one of her own bonnets, and money to purchase clothing.
Thinking the "savages" were a demoralising factor, he advised the Admiralty that he was determined to return the captives to Tierra del Fuego.
[8] He characterised her as a quick learner and wrote that Elleparu was jealous of any attention directed towards Yokcushlu, who he intended to marry.
FitzRoy later wrote that whaling boat captains reported that Yokcushlu would climb aboard their vessels to spend the night.