Erika was born in Nälden on 10 March 1988. She took up sports as a child, playing ice hockey and association football in addition to competing in athletics; she did not start concentrating on the high jump until she was 14. She was a leading age group jumper, clearing 1.86 m in 2004; the jump ranked her fourth on the world youth list that year, and second among athletes born in 1988 or later. In the following years her development stagnated, and she did not improve her personal best again until the 2007 indoor season; she placed fifth at the 2005 World Youth Championships and eighth at the 2006 World Junior Championships. In addition to the high jump, she occasionally competed in the long jump; she won both events at the 2005 Finland-Sweden youth international.
Erika won gold in the high jump at the 2007 European Junior Championships in Hengelo. In a very close competition, the top four all cleared 1.82 m; Erika later said she did not realize she had won on countback until a photographer told her. E improved her personal best to 1.91 m in 2008, but concentrating on athletics exhausted her mentally; she dropped the sport in 2009 and moved to Norway, where her brother lived, taking up ice hockey again. She had a brief comeback in 2011, winning bronze with a jump of 1.82 m at the Swedish championships.
In 2013 Erika decided to make a second, more serious comeback; she resumed high jumping in 2014, now as a student at the University of Central Missouri. In the summer of 2014 she married Daniel Kinsey, an American, and changed her name to Erika Kinsey.
Kinsey's results improved in 2015; she was NCAA Division II champion in the high jump both indoors and outdoors, and in the triple jump indoors, helping the Central Missouri Jennies win their first team titles. She unexpectedly cleared 1.97 m at the European Team Championships in Cheboksary, improving her personal best from the MIAA outdoor championships by five centimeters; the jump moved her to third on the Swedish all-time list, and exceeded the qualifying standard for the 2015 World Championships in Beijing.She debuted in the IAAF Diamond League in July 2015 in Lausanne, jumping 1.94 m and placing third.