She lifted 168kg to secure medals in 48kg weight category -- one each in snatch (74kg), clean and jerk (94kg) and total (168kg).
Her compatriot lifter Khumukcham Sanjita Chanu also competed in 48kg and finished fourth.
Mirabai, who got selected for the event after lifting 163kg in the trials, managed an additional five kg more during the main event.
Mirabai was fifth in 48kg weight category in the last edition of the tournament in Pattaya (Thailand).
She clinched gold in the dame category during the seventh National Youth (Girls) Weightlifting Championships held at Itanagar, Arunachal Pradesh last year.