So Kateryna is not grayed out for you in the living room? I don't think I missed any of the interactions with her and always picked being more forward. For Fairy I went with the healing path and am not interested in the other paths.I recommend first downloading the walkthrough if you haven't to make sure you are following the correct path if you are having these problems. Having said that, at first glance, you are probably on the wrong path, or perhaps have an earlier version of v0.15.
I was playing 0.15c, although continuing from a 0.14d save. Like I mentioned earlier in the thread when I tried to start a new game in 0.15c I ran into an error that didn't let me continue playing.
I don't enjoy playing with walk throughs.