https://www.marieclaire.com/celebrity/royals/altadena-girls-meghan-markle-inside-story/?fbclid=IwZXh0bgNhZW0CMTEAAR0mM1BFGq6fxhETjQWicqmNKugFjkpXVeOhML9TfkB9-XWIDza28M6ZX5Q_aem_RjoRYwDkBSMXY9GK4DHodQ The charity's 14-year-old founder, Avery Colvert, tells 'Marie Claire' what it was really like working with Prince…