Career
She was also part of the Dutch team that broke the 4×100 m medley Olympic record in the preliminaries. However, they finished fourth in the final. Lagerberg broke the world record in the women"s 200 m butterfly on 13 September 1958 in Naarden, Netherlands.
She was also part of the Dutch relay team that set a new world record in the 4×100 m medley in the same year.