Alongside the imagine, Roxy wrote: 'Life certainly never runs to plan - what timing. Such a brave little 😇 .'
Speaking to the Daily Mail Australia, a Sweaty Betty PR representative said: "We aren't sure as yet what is wrong with Pixie."
"She has been doubled over with abdominal pain since Friday afternoon so Roxy took her to Sydney Children's Hospital on Sunday morning with Hunter."
Pixie's mother later told the site, 'She is home now - the image is of her at a clinic this morning having an ultrasound and X-ray to determine what the problem is.'
Since then, Jacenko has shared a video of her recovering daughter in better spirits alongside her brother Hunter.
Jacenko also updated fans about her daughter's health condition. "UPDATE - thanks for the lovely messages, Pix is resting at home waiting for more info on what the problem is ❤️💊."
Jacenko's husband was sentenced to jail for insider trading in June 2016 and will be reunited with his family this Friday.