The 'You Da One' star was set to appear at the event tomorrow alongside the likes of Calvin Harris and Swedish House Mafia, reported Sun Online.
The event organisers made the announcement on their official website and confirmed that a replacement act will be announced soon.
The 24-year-old Bajan star expressed her grief after the death of her grandma Dolly in a post on her Twitter account.
"Goodbye #grangranDOLLY get your beauty rest until I see you," she posted.
The singer performed at Sweden's Peace & Love music festival following the news and is scheduled to headline the Wireless Festival in London's Hyde Park on Jul 8.
