if your maid does not sleep with the baby in the same room, she will not have the responsibility.
if i sleep with my baby, i won't ask her to help because one adult should be good enough to handle a baby. there is no need to make another adult awake and feeling tired in day time.
in fact, my maid sleeps with my baby. whenever my baby cries at midnight, she will take full care. i just take a look sometimes.
in my case, my daughter is sleeping in the same room with me. so i always take care of her at night.
I request the helper wake up at 6:30am, she should have enough sleep. It is good for both the helper and my baby when there is no others at home. My helper can go to bed at 9:00pm if she finish her duty.
Let's think this way, we are parents, we should take the responbility for our babies in most of time.