She also won the 2010 event at La Manga Club together with the Hedwall twins, as well as securing the individual medalist honors.

She won bronze at the 2010 Espirito Santo Trophy in Argentina together with Louise Larsson and Caroline Hedwall.

Lennarth won her maiden LET title at the Ladies Slovak Open in 2014, by four strokes over Mel Reid.

In 2021, Lennarth played in only five LET events before having to cut her season short due to a hip injury.

She served as the first tee starter at the remaining Aramco Team Series events for the rest of the year.