I've met a lot of "girly girls" flying in GA and airlines. All of them wonderful pilots, who put a lot of "blokey" male pilots to shame. So who cares if this girl has an instagram account in which she shares fashion tips and the like? I'm sure she's a great operator. Probably better to go flying with than a lot of the whingers on here. If you want to talk about "ego maturity" look at those who perform a disingenuous character assassination on an anonymous Internet forum.
There's pilots flying in GA or the military or who entered an airline through those paths who have selfie loaded instagram accounts as well. Do we bash them too or is that just reserved for cadets?
Whether you like it or not social media is a big part of marketing and recruitment these days. No doubt employers see it as method of promotion and spreading positive role models.
At the end of the day I think the naysayers here just hate em cos they ain't em....