Kate’s attendance will come as a surprise after she missed the traditional rehearsal event, the Colonel’s Review, last weekend.
Her health had become the subject of widespread speculation and baseless conspiracy theories after the palace said she would be taking a step back from public duties following planned abdominal surgery.
The wife of Britain’s future king responded to the months of fervent speculation with a video in March in which she revealed that she had cancer and was undergoing chemotherapy.
In Friday’s message, Kate also gave an update on her cancer. She said she was making good progress but that “my treatment is ongoing and will be for a few more months.”
Kate said: “I am making good progress, but as anyone going through chemotherapy will know, there are good days and bad days. On those bad days you feel weak, tired and you have to give in to your body resting. But on the good days, when you feel stronger, you want to make the most of feeling well.”
She said that when able, she found it “a joy to engage with school life, spend personal time on the things that give me energy and positivity, as well as starting to do a little work from home.”
She said she had been “blown away by all the kind messages of support and encouragement over the last couple of months,” which she said “really has made the world of difference to William and me and has helped us both through some of the harder times.”
Kate added: “I am learning how to be patient, especially with uncertainty. Taking each day as it comes, listening to my body, and allowing myself to take this much needed time to heal. Thank you so much for your continued understanding, and to all of you who have so bravely shared your stories with me.”
While a significant moment, this will not mark a return to a full schedule of public engagements. The palace gave no further details about future public events the princess might attend.
While Kate continues her course of preventative chemotherapy, she has also started to undertake some meetings related to her work.
Read More: Princess Kate to make public return at Trooping the Colour, shares cancer update
