We have three children, ages 9, 7, and 4. The four year old will be five in three months. She is very strong willed and resists discipline. She can be a very sweet girl, but she can also be very mouthy. When she misbehaves it is usually bossing me around, not doing as I ask, talking to me in a not nice voice, or being disruptive in church. This can escalate into her hissing at me, biting me, and trying to hit/kick me. I have tried all the discipline tactics that worked with our older children at this age: timeout, taking away toys, cancelling outings; all to no avail. Ironically, her preschool teacher tells me she is wonderful at school and enjoys having her in class. By the time her siblings were this age, they knew how to behave. What can I do to change her behavior?