Navjeet hurled the disc to a distance of 49.54m, bettering her previous best of 45.27m set at Douglas last year at Guru Gobind Singh Sports College.
Local lad Ankit Kumar also created a new national record in under-16 5000m walk, clocking 22:17.15 which removed Manipur walker Lokendra Singh's decade old mark from the record books.
Bhgwan S Rawal of Uttarakhand finished second in 22:19.70 while his teammate Sandeep Bind completes the podium in 22:49.25.
Hosts Uttar Pradesh also had another cheerful moment through Poonam Singh as she erased the meet record in junior women's 3000m race with a time of 9:58.99.
Delhi boy Beant Singh accounted for another meet mark of the day in under-14 600m race in 1:25.15.
Haryana's Sandeep Kumari retained her crown in junior women's discus throw with an effort of 41.82m. The same was the case with Maharashtra's Ankita Gosavi in 100m hurdles in under-16 group.
Overnight leaders Kerala slipped to second spot while defending champions Haryana climbed the ladder with 257 points, 11 points ahead of their rivals.