[4] In the DMV GT & Touring Car Cup she drove an Audi R8 LMS GT3 from 2017 to 2019, first with Aust Motorsport and later from 2018 with Rutronik Racing – winning the championship in 2018.

As a result, she stepped up to ADAC GT Masters with the same team – scoring a best championship finish of 24th place in her first season in the series with co-driver Dennis Marschall.

After achieving her Class A license, she became one of the founding drivers of the "Girls only" program by WS Racing; attempting to encourage more women into the sport.

[6] In 2021, Schreiner started in the newly founded BMW M2 Cup - a one-make series on the Deutsche Tourenwagen Masters support bill.

[9] She stayed in the category for the 2024 season and became the oldest regularly-entered driver, moving from ART to Campos and gaining support from Sauber as part of the series' agreement with Formula One.