She did the branding for most of the 'big' people in the influencer industry, including barefoot blonde (and the GMG collection, which is I'm sure how they met).
Checked her site, which is incredibly simple and boring for someone to have a creative/branding agency. But what do I know?
Maybe she knows the right people to get those type of clients, or is connected to someone else. She does seem more down to earth and genuinely lovely person just from the pics. I don't think Julia is a social climber as someone pointed out above, she does not have the need because a) she / Thomas has the money and b} they have the influence.
I don't think Rose is as obsessed with this 'bestie' content as she used to be, she seemed to have directed her attention elsewhere and probably learned her lessons around these friendships along the way. I still can't believe that Thomas was the best man for her husband, that says a lot about her husband's friend circles, or the lack of them.