Pixie Geldof, 23, was scheduled to play the Old Navy Oasis event on April 12 at the Californian festival - but it has now been confirmed that the DJ will not be appearing.
'We can confirm that Pixie Geldof was scheduled to DJ at The Old Navy Oasis event, but is no longer participating.'
The younger sister of 25-year-old Peaches was seen arriving at her father, Bob Geldof's home on Tuesday.
On Wednesday a Post Mortem report came back inconclusive, meaning that the family must now wait for toxicology results.
Pixie is Peaches' sister by parents Bob Geldof and Paula Yates, along with their elder sibling Fifi Trixbelle.
Fifi paid tribute to her younger sister on Twitter, writing: 'My beautiful baby sister…Gone but never forgotten. I love you, Peaches x.'
She accompanied the post with a picture of the two of them as children.