The left-arm spinner bowled superbly to restrict the Lankans to 100 for 8, which India chased down in 14.4 overs. With the play-off win they also qualified for the 2014 event.
Colombo: Left-arm spinner Ekta Bisht ripped apart the Sri Lankan lower-order with a hat-trick as India outplayed the hosts by nine wickets in the play-off match of the ICC World Women Twenty20 to ensure their participation in the next edition of the tournament in 2014.
India restricted Sri Lanka to a modest 100 for eight after Bisht claimed a hat-trick in the last over in which the hosts lost four wickets and scored just three runs.
Chamari Atapattu was the top-scorer for the home team with her 28-run knock. Skipper Shashikala Siriwardene (23) was the other major contributor for Sri Lanka.
Chasing 101 to win, Poonam Raut (45) and skipper Mithali Raj (28) shared an unbeaten 64-run second-wicket stand to guide the side to its very first win of the tournament with 5.2 overs to spare.
India had lost all three Group stage matches to reach a stage where they needed to beat Sri Lanka to keep its right of playing in the next edition of the event.
Sri Lanka were already struggling at 99 for four when Bisht came to bowl the last over of the innings and piled on the hosts' misery with her superb bowling.
She first dismissed Dualani Surangika (10), having her caught by Nagarajan Niranjana and then caught Yasoda Mendis (10) off her own bowling in the next ball.
Eshani Kaushalya (0) could not survive the hat-trick ball as she was caught by Jhulan Goswami. More drama was to follow as Sandamali Dolawatte ran herself out while attempting a single on the penultimate ball of the innings.
In reply, India lost opener Sulakshna Naik (17) in the fourth over when she was caught by Chamani Seneviratna off left-arm spinner Inoka Ranaweera.
Naik's 17 came off 15 balls with three shots to the fence and she added 38 for the first wicket with Poonam.
Skipper Mithali joined Poonam in the middle and the pair led the side to win without any fuss.
Poonam's 40-ball 45 had five boundaries in it while Mithali's 28 came off 33 balls with the help of four shots to the fence.