Heather wrote:

Thank you so much for your kind and caring messages. That means so much 🙏 I’ve had to make the very difficult decision to cancel tonight’s show in Diest as well. 😔 As I said in my last post, I have waited 2 years to do these shows, and you’ve kindly waited for me, so It feels horrible to disappoint you. My team has rescheduled last night and tonight’s shows (Kortrijk, Diest) for the 22nd, 23rd November. (Or you can of course get a full refund from the ticket office. ) I am so sorry 💜

Source for this info:
https://www.facebook.com/HeatherNovaOfficial