Gardner, 29, has been at the centre of controversy since July, when her estranged wife, Monica Wright, alleged in an Instagram post that Gardner had an affair with Australian teammate Georgia Voll. Gardner and Voll are now in a relationship.
Speaking at the Sixers' season launch, Gardner said the past few months had been challenging but that cricket had provided an escape. "Cricket's been a really fantastic escape ... it's been a bit of a shining light," she said. "It's obviously been challenging. Yes, it's my private life, but I guess these things become more of a public matter."
The all-rounder has continued to perform on the field, helping Australia win the T20 World Cup and captaining Trent Rockets to victory in England's Hundred tournament, as well as featuring in recent white-ball matches against Bangladesh and New Zealand.
Gardner said she had been able to compartmentalise the scrutiny, though some days were tough. "There were certainly days that it was tough," she said. "That's my job at the end of the day. Life still happens [and it is about] being able to put my full focus into what whatever I guess was needed from me, and that's obviously cricket."
Gardner retained her role as Australia's vice-captain, with Cricket Australia chief executive Todd Greenberg saying "additional policies" would be introduced to navigate her relationship with Voll. The Sixers also confirmed in July she would remain captain for the new WBBL season.
Thanking outgoing Sixers general manager and former teammate Rachael Haynes for her backing, Gardner said the club meant a lot to her. "Obviously this club means a lot to me," she said. "To have the backing from the people at the top [means a lot]. I've known Rach for a really long time."
Gardner's Sixers open their WBBL campaign on Friday against the Brisbane Heat.