I don't care if she posts half naked photos. Do what you like. If that's what makes you feel "empowered" then go for it, even if there is clearly deeper conversation to have around the psychology of social media and how it distorts how we view and showcase ourselves and others.
The problem lies in the fact that the content she makes (24 hour challenge videos with her young sibling, etc.) doesn't match up to the demographic she's trying to attract on Instagram. She knows most of her subscribers are girls between the ages of, say, 13-17, yet her content is very much for the male gaze. People can argue that not everything is for the male gaze, but since the majority of her relatability is her talking about boys, there's clearly a connection there. Yes, sex sells, but your audience is young and impressionable and of an age where sex should not be the selling point.