 From 1996 to 2002, Keizer played for her local club, Orion Volleybal Doetinchem, where she rose from the youth ranks to the club's first team that played in the Eerste Divisie, the third division of the Dutch volleyball league system.Keizer was scouted by the national beach volleyball team when she was 15.For the next few years, she continued to play club indoor volleyball while spending the summer off-seasons training with the junior national beach volleyball team in Dwingeloo.