Fans were quick to wish the 7-year-old a speedy recovery.
"Tough girl!" one wrote, with another adding, "Glad it wasn’t broken! Hope she is feeling better soon and back out having fun!"
Another said, "Poor baby, feel better soon!!"
A third echoed, "Stay tough Willz! You’ll be back on the bars in no time."
Earlier this week, Willow showed off her singing chops alongside mum.
Willow is a guest artist on the upcoming album, The Greatest Showman - Reimagined, which is due out in mid-November.
In the video, Willow is shown recording her version of A Million Dreams (Reprise) which will be featured on the album along with her famous mum's version of A Million Dreams.
Safe to say, fans have lost it over the incredible clip!
