Her eighth start was the Memsie Stakes at Caulfield Racecourse, where she defeated eight rivals after a long injury break, and it confirmed her as Australia's best racehorse.
Atlantic Jewel died in August 2020 of a haemorrhage, after giving birth to a colt by Justify at Coolmore Stud in the Hunter Valley of New South Wales.
At her next start, she stepped up to Saturday class and won by just under a length with jockey Michael Rodd easing her up.
After winning another race over 1,400 metres (1,500 yd) by 2.8 lengths, Atlantic Jewel stepped up to group one level.
Atlantic Jewel would have started a short-priced favourite in the Oaks, but injury ruled her out of the rest of the spring.
Ridden by her regular jockey, she won by 3.8 lengths, beating home group one Stradbroke winner Mid Summer Music.
In the race, she led most of the way; however, she suffered defeat for the first time as It's A Dundeel, the Sydney Triple Crown winner, sat outside her and beat her by a short half-head.