Hege was born in Hønefoss in Buskerud county, Norway in 1991, but she has been living in Hovet, Buskerud her whole life.
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Competing for the first time in the senior class, Bøkko won six medals over two days in the Norwegian 2009 championships at Gol, 20–21 December 2008; gold in the 500-m, silver in the 1500-m, bronze in the 3000-m and 5000-m (where the results also are valid as that season's national championships single distances event), as well as in the allround samalogue.
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At the second Junior World Cup, organised one week later in Asker, Bøkko won the 1000-m and came second in the 500-m.