When the moment finally arrived the Duchess told her it was nice to meet her as well "and I hope everything goes okay with your treatment".
She also thanked Lili for the flowers which were "really pretty".
Lili has had three operations and 17 radiotherapy treatments with a further 13 to go for a brain tumour that was diagnosed when she was 5.
Mr Reynolds said she suffered from headaches doctors couldn't explain and eventually a CT scan revealed the tumour .
Since then she had been very brave and had told the Make-A-Wish Foundation she wanted a princess playhouse.
She also wrote that she wanted to meet a princess who was "royal and beautiful". Make-A-Wish co-ordinator Louise Judd then contacted Team NZ and arranged a meeting with real royalty.
Lili mainly spoke with Kate but did shake hands with Prince William. It was more exciting than nerve- racking, Lili said. It was nice to see the royal couple up closer than almost everyone else had. "I'd seen them before in magazines and a little bit on TV. She is really beautiful." The couple pointed out the boats they would be racing on. "They said they were going for a ride." The people she'd told about the meeting were "so jealous".
Donations
If you want to make a donation to help wishes come true like Lili's text WISH to 5464