Police said they were forced to act after tensions began to boil over among the crowd and queue jumping led to several people collapsing and needing medical assistance.
Footage posted to TikTok show the fans waiting outside chanting. Police can be seen trying to disperse them.
"Due to the size of the crowd and lack of appropriate security and other event planning in place to cope with the larger than expected crowd, and in consultation with the store management, the event was closed down and police commenced dispersing the crowd from the area," a police spokesman said.
One person claimed fans had camped overnight to meet the star.
"I got there at 2am and got to see her but only for a split second and barely could say anything but still very grateful. So sad it got cancelled," one said.
The Queenslander, who has over five million TikTok fans and two million on Instagram, posted to social media apologising for the event being cancelled and saying she'd tried to work with police to control it.
"Due to safety, the West Australian Police had to shut down the Perth meet and greet early," she wrote.
