Bangkok: Yingluck Shinawatra is poised to become politically-turbulent Thailand's first female Prime Minister on Friday after riding to election glory on the coat-tails of her fugitive brother.

Members of the country's newly-formed Parliament are due to elect Yingluck, whose Puea Thai party and its partners command a three-fifths majority in the lower house.

She will face the immediate challenge of bringing stability to the kingdom, after five years of political turmoil since her brother Thaksin Shinawatra was thrown out of office in a 2006 army coup backed by Thailand's elites.

"We are still in the middle of a very big conflict in the country with very different ideas about what government should be, and what it should be doing," said Thailand expert Chris Baker.

After her selection by lawmakers, the country's 28th prime minister can expect royal endorsement within days to formalize her position.

Analysts believe a key test for Yingluck will simply be whether she can hang on to power in a country where the removal of leaders is commonplace.

Thailand has seen 18 actual or attempted military coups since it became a Constitutional Monarchy in 1932 and only one Prime Minister in that time has served a full four-year term -- Thaksin.