You must keep her busy before baby born!!! As I think she must be very busy after baby born so I did not give much work to my ex-helper before giving birth. At that time, she was very relax and went to sleep around 10 to 11pm.
But nightmare comes after baby born as she used to relax. She black face to me when I asked her to make milk at midnight. Actually she just make the milk and I feed myself, but she is not willing to wake up at night so black face.