In 2009, she assumed responsibility for the budget when Essen went on sick leave, and at the age of 22 she became a substitute municipal councillor.

Busch made several comments to the media during 2010 criticizing the then party chairman Göran Hägglund, and what she perceived as his weak leadership following the 2006 General Election.

[20] Her time as leader was long characterized by an uncertainty on how to profile the party, and consistent low numbers in opinion polls.

Her early attempts to gain votes by adopting tougher positions on immigration and law and order were thwarted when the Moderate Party usurped that space.

At the same time, Busch continued to position the party in a more conservative direction on other issues like the opposition to Mosque prayer calls and gender science at preschools.

[24] The Christian Democrats received only 2.9% in a big opinion poll published in May 2018, and the party's fortunes looked bleak.

[28] When interviewed by Dagens Nyheter in February of 2018, Busch claimed that immigration to Sweden has led to a crisis regarding values[29] and later on, ahead of the 2018 Swedish general election, said that heading towards multiculturalism is a mistake and argued against it.

[30] Busch reiterated her party’s new harsher stance on immigration in 2019 in a debate article with her party’s spokesperson on migration, Hans Eklind, where they wrote that they deem it necessary to decrease the amount of granted asylums in Sweden to the same level of neighboring countries, which would result in a much smaller immigration.

[38] In September 2024 the Government announced subsidies to municipalities willing to construct new land based wind farms.

[45] Busch pleaded guilty to a charge of grave defamation in July 2021 and was sentenced to probation and a SEK 60,000 fine.