In
2016 Czech regional elections, Decroix ran for the Civic Democratic Party as a representative of Vysočina Regional Representative, but was not elected. She was only elected in the
2020 elections, originally being as the 12th candidate but ended in third place due to preferential votes. Decroix failed to run for the Civic Democratic Party in the
2018 Czech municipal elections for the City Council of Jihlava. With citizen democrat Petr Laštovička resigned from his mandate at the beginning of 2020, she became the new city representative. In the
2022 municipal elections, Decroix ran for Jihlava council from the 14th place as a candidate of ODS and KDU-ČSL coalition, but was not elected. In the
2019 European Parliament election, Decroix ran as the sixth ODS candidate, but was unsuccessful and became the third alternate. During the
2021 Czech parliamentary election, Decroix finished second place as a member of the Civic Democratic Party in the Vysočina Region. In January 2022, she became a member of the Subcommittee for the Support of Democracy and Human Rights Abroad before serving as chairwoman the following year. At the 31st Civic Democratic Party congress in April 2024, Decroix was elected vice-president of the party, receiving 311 votes from 528 party delegates. On 10 June 2025, Decroix was appointed as Minister of Justice in the
Cabinet of Petr Fiala. ==Personal life==