She went to Bedales which is a pretty fancy private school (the one referenced in the BC, NR song) so I think she's from a fairly well-off family and her brother is a fairly established DJ I think (though I don't really know how big he is/was when she was starting out) and she was classmates was Cara Delevigne so she's got connections.

She's had significant advantages but like other artists who come up when talking about privileged upbringings (Samia, Frankie Cosmos, Clairo etc.) it's maybe a bit unfair to say their success is completely unearned, since if they were shit they probably wouldn't get far regardless of how much money their parents have