Fujishiro does seem like an idiot. Not in a particularly bad way though, just... simple. She's pretty shallow right now, and she has very little inhibition, but seeing as romance manga seem to be all about lack of communication, that could actually be a good thing. Or at least a refreshing change of pace. This assumes the whole thing will be more than them becoming "very good friends but definitely not 100% canonically lesbians got it?" at some point.
I anticipate her attempt to make Kurokawa pretty will come back as a lesson and some growth for Fujishiro down the road. "Beautiful on the inside" and such. That said, I'll be disappointed to see those eyebrows go.