She ended up as member of the central committee of New Democracy and the party's section responsible for Education and Religion.

She was a member of the Standing Committees of Foreign Affairs and Defence, and also of Public Administration and Justice.

[1] With the formation of the First Cabinet of Alexis Tsipras, she was appointed Deputy Minister for Macedonia and Thrace.

Ultimately, she resigned from government on 15 January 2019, together with party leader Panos Kammenos, when the Independent Greeks left the government coalition in disagreement with the upcoming ratification of the Prespa Agreement, by which both countries agreed to the country's renaming to North Macedonia.

[3][4] Kollia-Tsaroucha was a member of the Interparliamentary Assembly on Orthodoxy's International Secretariat, holding the position of treasurer.