Contreras is 155 cm (5 ft 1 in) tall 53 kilograms (117 lb), born on March 27, 1986, in San Pedro de Macorís.

[4] She is married to José Ariel Peña,[6] and is the cousin of Wanda Rijo, two-time Pan American Games gold medalist in the –75 kg weightlifting category.

[7] When Contreras was a teenager she started training in athletics in San Pedro de Macorís, where she grew up,[6] but had to quit because her father could not take her to practice every day, and she was not allowed to go by herself.

[4] In November 2011, the ex-rector of the Universidad Autónoma de Santo Domingo Franklin García Fermín used posters of Yuderqui and Gabriel Mercedes, without permission, to promote the presidential candidate of the Dominican Revolutionary Party Hipólito Mejía.

[5] As a 17-year-old she won the silver medal at the 53 kg category at the 2003 Pan American Games,[15][16] held in Santo Domingo, Dominican Republic.

[23] In 2006, Contreras was selected by the local Olympic Committee and Cervecería Nacional Dominicana as Athlete of the Year for 2005[24] and received an award of RD$100,000 (approximately US$3,125 in May 2006).

[8] In recognition of her athletic success representing her country, the Dominican Republic Sports Ministry rebuilt Contreras' house, being re-inaugurated in February 2007 by the Minister Felipe Payano.

[32] Later that year, she was selected by the Dominican Republic Olympic Committee as the flag bearer at the 2007 Pan American Games.

[42] The 2008 Dominican Republic Military Games saw Contreras win the 58 kg for the later crowned event champion, the National Army.

[44] For her 2007 year-round performance, the San Pedro de Macorís Guild of Sport Writers awarded Contreras in May, as her province "Athlete of the Year".

[48] After competing at the Olympics, Contreras tested positive for a CERA enhancer drug, and faced a two-year suspension,[22][49] but the backup B sample was negative.

[61] That September, Contreras won the silver medal in snatch and bronze in total at the 53 kg category from the 2010 World Weightlifting Championships in Antalya, Turkey.

Even though she could lift more weight, her main goal was to prepare for the upcoming Central American and Caribbean Games[96] and cumulate points for the 2016 Summer Olympics qualification.

[97] Contreras went to the 2014 Central American and Caribbean Games as one of the main medal hope,[98] she was trying to win the gold and set new records[99] working with her coaches Héctor Domínguez and Félix Ogando.

[100] During the 2015 Pan American Games in Toronto, she was training without pain from her previous injury[101] after having surgery to correct a lumbar hernia in January[102] but could not reach the level of her two previous Pan American Games golds in 2007 and 2011, failing three times to lift 88 kg in the 53 kg snatch.

She also saw her clean and jerk record fell in the competition to the later gold medalist, the Colombian Rusmery Villar, improving the mark from 112 to 115 kg.

[103] Team partner and bronze medalist Yafreisy Silvestre later revealed that Contreras was suffering from an injured leg before the competition.