Chelsea has two extremely different sides. In day-to-day interaction, she's very much what one would expect of an extremely privileged child of diplomats/politicians on one side (her maternal American family) and a peer of the realm on the other (her paternal Scottish family). She's well-mannered and down for a good time so long as it doesn't cross the line into "aristo gone wild". She plays the part of accepting it's inappropriate for her to work for a living and that while advocacy for those in need is okay, but steers clear of things that might seem seditious.
The other end is her alter ego, Codename: Birdie, the mystery woman behind A Little Birdie Told Me. A sociopolitically subversive leftist blog/series of social media accounts that provides a platform for literature, art, essays, calls to action, and the occasional blind (or not so blind) item to shame aristos shamelessly exploiting their privilege. This is well underwraps and while Birdie is well-known, no one has any idea of her true identity.