However just hours later, Elly shared a series of photos and images of herself and friends attending a pool party.
The posts have since been deleted, but the reality star's followers have been leaving messages calling her out for her contradictory posts on her latest Instagram post.
“'Growing up I had celebrated Australia Day, because I did not know any better and it took me to have some conversations with Indigenous friends and work colleges to truly understand the meaning of the day and the Indigenous culture, and it’s not good' then 3 hours later at a pool party celebrating," one noted.
"Very conflicting messages you’re sending out today.. Change the date or continue to have bogan p*** ups??" questioned another.
"She really had us in the first half hey hope you enjoyed your invasion day party ! Hope the rally didn't take up too much of your day xx #alwayswasalwayswillbe," penned a third.
Others even questioned whether Elly had in fact attended the Invasion Day protest.
"One quick photo at the protest today - were you even there? Then off to a big party to celebrate Australia Day, your manager must have reminded you to give some lip service and a quick pic and then off to get blind and party. Performative influencers don’t worry it doesn’t go unnoticed," one wrote.
Elly isn't the only celebrity to face backlash for celebrating Australia Day.
Singer and former Voice coach Delta Goodrem was criticised when she shared a series of images from her rehearsals for the 2021 Australia Day celebrations at the Sydney Opera House.
"Disappointing to see you supporting a day that persecutes our Indigenous population by its mere existence," one of Delta's followers wrote beneath her post.
"Tomorrow ought to be a National day of mourning, not a celebration. Sad you can’t see the significance for First Nations people and would support a day of celebration when it commemorates the genocide of thousands of Indigenous people and the destruction of an ancient culture and people. #changethedate," another remarked.
UPDATE: Elly has shared a message of apology to her fans admitting that she had a "complete lapse of judgement."
"To answer people's comments from yesterday, there is nothing else I can say in this situation other than, 'I am sorry.' I had a complete lapse of judgement and have a lot of regret for my actions. I sincerely apologise for upsetting anyone," she wrote in a typed statement shared to her Instagram Stories.
"I stand by my attendance at the Change The Date protest and feel that it is an incredibly important issue. I truly wasn't being insincere with my attendance. I know how it looks, we all make mistakes - I made one yesterday and all I can say once again, from the bottom of my heart is that I am truly sorry. x"