Occasionally, I let her have a voice.

From Doll:

“The rules:

Never stop when she says "When".
Give clear and specific instructions.  She shouldn't do anything without your explicit command.
Don't hesitate to punish her if orders are not fully executed and abided by.
Never ask her of she's okay.
Use her to get what YOU want.  Don't even take her into consideration. 
Know that her blood and tears are expressions of her love and devotion to you."