I mean that is Blodmoon Ari, pretty sure that happens when she is exposed to the moon, that is why in the nightclub you are not allowed to put her in the room with the moon
that would be the logical explanation though it's odd blood moon ari would have a penis and not normal ari. I don't know, but it does make sense considering that and she's strangely not present in night 12. And yet on kill screen the face looks like a different humanoid girl? Kind of hope we can do something more with her like domestic to us the night guard only or something else. There are at least 3 more ????? tapes so who knows what's next