With this win, Australia has topped Group 1 with three wins in three games and six points. SL is at second with two wins in three matches and four points
Megan Schutt then took three wickets in the final over as Sri Lanka ended on 112 for eight before Healy (54 not out) and Mooney (56 not out) saw Australia home without losing a wicket.
Laser-precise seamer Marufa Akter ripped through the Sri Lankan top order but Samarawickrama and De Silva steadied the ship to claim Sri Lanka's first-ever back-to-back wins at a Women's T20 World Cup and extend their impressive start in Group A
Chasing a tricky 151 Sri Lanka openers Harshitha Samarawickrama and skipper Chamari Athapaththu started off well scoring 13 runs in the very first over bowled by Renuka Singh.