Hiretsuna can move in the four directions and step on her switches, she need to mimic the same order the gorilla shows her.
If Hiretsuna isn't in your party it's because you had a savefile in the previous non fixed version.
Give me a minute to prepare a quick fix, so you won't need to start from scratch.
It will appear in the downloads in a few minutes as 0.5.21. I'll delete the previous version in order to avoid confusions.
Done, just open the map again and Hiretsuna would appear. Altough she would need to level up later.