The woman, who did not want to be named, posted the photo to a community Facebook group to warn of the dangers,Yahoo Newsreported.
She said the stunt wasn't 'worth the risk' of being injured or killed and that the girls' behaviour was 'disrespectful' because they had ignored warning signs posted near the cliff's edge.
'They were trespassing, there are signs everywhere and they ignored them,' she said.
'It really is their parents and emergency services that have to deal with the consequences of this.'
The National Parks and Wildlife Service Public Affairs Officer Felicia Eccles said the nature of the site was unpredictable and dangerous.
A recent study has revealed that more than 250 people have died in the past six years while trying to take the perfect selfie.
Researchers, from India, found that between October 2011 to November 2017, 259 people had died while trying to take the perfect selfie.