Drooling
12Dames
She really should cough up the truth of her having previously been a human, before it gets revealed in an untimely dramatic moment that leads to misunderstandings, lack of communication that could easily solve the situation in five minutes and forced drama that can last 5-10 chapters and derail any good times and plot. It wouldn't even be that shocking for the witch girl, since she too was born human and then became a witch, they'd be even more similar - former humans, betrayed by their own ilk and hunted by both humans and demons alike.
But naaah, let's wait for that reveal until it can cause the most forced convoluted drama as possible, as per the usual rules of quality writing we have all come to expect from fiction.