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When you shatter her Koteka/Penis gourd, the real cat girl is the one with the exposed penis. Also, stock up on mushroom soup if you're having difficulties. Hope that helps!

I also had alot of trouble with her. The best advice i could give is get alot of the mushroom stews from catera. I forgot what exactly it was, the one thats 10 golden spores. Also try and beat remis sister first so you can get her weapon. And make sure you dodge alot. Then just kinda keep fighting her till you win.

Using the cursed sword from the big fox sister melts every boss, try to dodge a lot by jumping and staying somewhat afar when she is making her lifting staff animation.  

During her second phase, you can find easily the real boss by following the little puppet cat, it follows her everywhere. 

And, the old reliable, lots of food and knives 👌