Your mom is turning into a bat, but the strange part is that her form will always remain half human and half bat. But her behavior and mental state is still becoming that of a feral bat.

You walked downstairs and found your mom hanging upside down in the living room, since it was daytime she was currently asleep.

Your dad walked in and lead you back to your room telling you that it’s probably best to leave her be due to her feral nature.