Career
In 2000 she became the first Chilean archer to compete at the Summer Olympics, but after failing a drug test in 2002 she left archery to study law. She later returned to the sport. In 2011 she was voted "Chile"s Athlete of the Year" after winning at the 2011 World Archery Championships.
She was selected to be Chile"s flag-bearer at the 2012 Summer Olympics.
In 2000 van Lamoen married doctor Norman MacMillan. Their marriage lasted three years.
That same year she became the first Chilean to participate in archery at the Olympic Games in Sydney, but she had a brief and lackluster performance. In the ermoval round, she had to face Sayoko Kawauchi (Japanese, sixth in the standings with 654 points), and lost the match by 151 to 146.
Doping and subsequent fluctuations (2002–2010)
In 2002, van Lamoen had an outstanding participation at the VII South American Games held in Brazil, where she earned 7 medals (6 gold and 1 silver).
However, all would be overshadowed by a doping test that tested positive in amphetamine, after which she was disqualified and had to return all earned medals. Although the Chilean Federation of Archery (Fechta) fined van Lamoen with a suspension for one year, the International Federation of Archery (FITA) decided to extend the punishment to two years, decision that the athlete appealed later, because the punishment exceeded international regulations. The appeal at the Court of Appeals of Santiago was later on accepted.
After a Supreme Court ruling, Fechta also lowered its initial penalty of one year to six months.
However, she could not participate representing Chile at the Olympic Games in Athens, as the team from Mexico filled the vacancy to which she aspired. At the XV Pan American Games in Rio de Janeiro 2007, she reached the second stage, where she was eliminated by American Jennifer Nichols.
After a break of two years to resume her studies, van Lamoen returned to competition in 2009, beating four Chilean records. In January 2010, she qualified to participate in the IX South American Games, held in Medellin, where she earned a bronze medal (30 meters, with a score of 343 points) and a bronze medal in the elimination round, where she defeated Ana Maria Rendon of Colombia by a narrow lead of 99 to 98.