She won numerous youth and junior medals at the continental level and competed at the 2003 World Championships in Athletics and the 2004 Summer Olympics while still a teenager.

There, Inés attended local school in Nuestra Señora del Cocharcas and eventually earned a bachelor of laws from Los Andes Peruvian University.

[7] As the youngest in the field at the 2002 South American Junior Championships, both Nadia Rodríguez and Silvia Paredes (two and three years older than Melchor) got the better of her and the Peruvian left with only a 3000 m bronze medal.

[8] In the younger age bracket she won the 3000 m at the South American Youth Championships and also managed a bronze in the 1500 metres.

[17] She was South America's best performer in the junior race at the 2005 IAAF World Cross Country Championships, coming 29th overall.

[22] At the Pan American Games she ran in the 10,000 m and broke Marilu Salazar's fourteen-year-old Peruvian record with a time of 33:36.17 minutes for fifth place.

[24] She went unchallenged in either event at the 2008 South American Under-23 Championships in Athletics, held in Lima and left with two gold medals.

[25] She reduced her national records further at the 2009 South American Championships in Athletics held on home turf in Lima.

[33] On April 12, 2015, she won the Santiago Marathon which confirmed her qualification for the 2016 Summer Olympics in Rio de Janeiro.