It's a lot to comment on if you don't have an understanding of the history of how the media has represented eurocentric features which are typical for white women vs features that are typical to black women, so I would start there if you wanted to do some research on the topic.
But long story short, Jesy being ridiculed for her natural appearance meant that she turned to and was able to pick and choose which typically black features she wanted to accentuate (bigger lips, darker skin, curly hair etc) to alleviate her self-confidence. She's able to do this because there's a history of white women succeeding & profiting by doing the exact same thing (e.g. the entire Kardashian family) without having to face the racism and ridicule that black women have had to endure throughout history because black features are only deemed desirable when they aren't on black skin.
Meanwhile black women continue to endure those same self-confidence issues without having the luxury to co-opt eurocentric features, and still aren't seen as an example of what classic beauty is, despite 'the kardashian look' being a blueprint for pretty much the majority of young girls in western society today, and for the last 10 years or so.
The real issue that needs to be addressed is those in the media & public who deem it acceptable to be fatphobic (I assume this is what Jesy went through) and drive down the self confidence of similar young girls, and for her to seek counselling for the trauma she experienced rather than simply freely co-opting blackness when it's convenient and profitable.
), I'm sure you can understand that if you had, maybe you would feel differently? It's very easy to be objective with no subjective experience.