Lather was born on 10 February 1992 in Jind, Haryana, to Prem Singh and Nirmal Devi.[1][2] According to lather, after initially trying kabaddi and wrestling, she started playing boxing when she was 18 years old.[3] She is coached by Anoop Kumar.[1]
At the 2016 AIBA Women's World Boxing Championships, Lather entered the quarter-finals after defeating Nomin Deutsch of Germany by 3–0 in the 57 kg division.[6] She then registered wins over Aneta Rygielska of Poland and Kazakhstan's Aizhan Khojabekova by a scoreline of 3–0 in the quarterfinal and the semifinal respectively.[7] In the final, she had the upper hand in the first round against the top-seed Alessia Mesiano of Italy, but the Italian boxer made comeback in the next three rounds, winning the bout by 2–1.[8]
Lather represented Railways Sports Promotion Board (RSPB) at the 2018 Senior National Boxing Championships in the featherweight division (54–57 kg). She won the championships after defeating Shashi Chopra of Haryana in the final by 5–0.[13] After receiving byes in the early rounds of the 2018 Asian Games,[14] Lather lost to North Korea's Jo Son-hwa by 0–5 in the quarter-final of the featherweight division. The bout was slow-paced and each boxer was warned once for clinching.[15]