I tested by removing healthypixies and everything suddenly just works now...Honesly, I don't know. Pixies in private is clearly said to be very buggy, and I've experienced restless girls bug myself, but I don't know about healthypixies.
I thought that Healthypixies was required for some of the pixie commands like moving them back and forth between cage and breeding room but everything just works now...
I don't even know what Healthypixies was supposed to fix or change