In 2015, Johanna played her first season on the LET Access Series and placed fourth on the LETAS Order of Merit securing her card for LET in 2016. Johanna claimed her first victory at the Larvik ladies Open in a record breaking 14 hole play-off. Johanna had a further 11 top twenty finishes during the season including 7 top 10s. Johanna’s lowest round of the season came at the CitizenGuard 24 GolfSeries Hamburg Open with a final round 68, four under par.
Johanna turned professional in September 2014. Johanna finished in 4th place at the Lalla Aicha Ladies European Tour School Pre-Qualifying in 2014 but narrowly missed out at the Final Stage.