Well aware of his daughter's love for all things princess-related, Mr Marshall had mused: 'Maybe she should meet Princess Kate... She will be coming to Calgary, after all.'
Little Diamond was overwhelmingly enthusiastic, and she wrote a letter to the Duchess, which read:
'Dear Princess Kate.Her father also added a few words:
My name is Diamond Ann. I am six. I was named after Princess Diana. My Mommy Memory is in heaven with her. 'I have cancer. I spend a lot of time at the hospital. I watched you get married from my bed there. You looked pretty. I like playing Princess dress up. My favourite princess is Aurora. Who is yours? I would really like to meet you. Do you wait [sic] to meet me too?'
'Should the Duke and Duchess of Cambridge just happen to swing by for a little visit, it would go a long way for helping her spirits, her surrounding family and friends. She is in awe of Princess Kate's fairytale-like story.'
In June they found out that Diamond had been chosen to present Princess Kate with a bouquet of flowers as part of the official welcoming.
When the day of the arrival of the royals came, Diamond was so thrilled by the chance to meet Princess Kate, that instead of handing her the bouquet, she flung herself forward for a hug, much to Catherine's delight.
After her meeting with the Royal couple, Diamond said:
'She told me she liked the flowers a lot. She was as fancy as she looks on the TV.'
Mrs Marshall, who stood close to the little girl throughout the meeting, told how the Duchess complimented Diamond's dress. She described Princess Catherine as 'so lovely and so gracious.'
'For a little girl who has dreamed of meeting a princess it was a dream come true.'
The royals had a very successsfull trip to North America, but there was no better moment than this.
Do you have a favorite Princess?
I certainly do.