Kate Middletonsmiled for the cameras as she walkedPrincess Charlotteto school last week — but behind-the-scenes, the royal mom is also very much part of the school community.

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Duchess Of Cambridge Attends ‘Mental Health In Education’ Conference

Kate Middleton and Princess Charlotte.Aaron Chown - WPA Pool/Getty Images

Princess Charlotte

“Kate came up and personally spoke to me afterwards, which was nice,” Virgo tells PEOPLE. “We spoke about the work that I do in schools, particularly for younger people, and we spoke about the importance of early intervention and prevention. She was very chatty and friendly.”

The three-hour session in May involved a 75-minute chat with Year 7 and Year 8 students (11-13 year-olds). “We get them to think about the kind of emotions they feel throughout the week, and what causes those emotions,” explains Virgo, a recovering anorexic whose memoir,Stand Tall, Little Girl,is being released in a new second addition in October. “It’s about being kind to themselves and not constantly comparing themselves to everyone around them.”

9/23 Cover featuring Princess Kate

Kate, who founded the mental health charityHeads Together, along withPrince WilliamandPrince Harry,has been praised for her work in both mental health and child development. Says Virgo: “It’s all very positive and people are feeling more able to open up about things, which is great.”

source: people.com