The 42-year-old entered parliament only last year after a decade in local politics, and was reluctant to make the change at first.

"It was not easy to enter politics, a profession that isn't very appreciated in Slovenia," she states in an official biography on the website of her centre-left opposition Positive Slovenia party.

"But I believe and hope that we, politicians, will manage to improve that image."

Her main objective as a politician was to "restore hope and trust in our state since, without that, all the government or parliament's measures have no sense," Bratusek said.

A former finance ministry official in charge of the country's budget, Bratusek graduated from Ljubljana University with a degree in textile engineering before doing a masters in management.

Born in Celje, in the northeast of the country, she joined Positive Slovenia (PS) in 2011 and was elected to parliament later that year.

Before that, she was a local councillor in northern Kranj, where she was elected twice for four-year terms, in 2006 and 2010.

Bratusek's big break came courtesy of Slovenia's anti-corruption authority which pointed the finger in January at both centre-right Prime Minister Janez Jansa and PS leader Zoran Jankovic over financial irregularities.

Ljubljana Mayor Jankovic resigned first, making room for Bratusek to take over as PS leader. Jansa was ousted in a no-confidence motion in parliament on Wednesday evening, completing the newcomer's rapid rise to the top.

A mother of two, Bratusek has a difficult task ahead, seeking to strike alliances with parties that just recently abandoned Jansa's sinking coalition ship.

She will also have to step out of the shadow of former party leader Jankovic, who will be keen to intervene in decision-making despite his resignation from the party helm.

"Under normal circumstances, she could be a rather decent prime minister," political analyst Vlado Miheljak told AFP.

Her main challenge over the coming days will be to cobble together a cabinet to present to parliament, something she has two weeks to achieve, he said.