I agree 100% with what Jax just said.
You cannot allow your child to control you, nor should you fear her. The more you allow this, the worse it's going to get. It may even benefit y'all to seek a child psychologist, or family counseling, if once you have set certain rules,discipline and you aren't getting any positive results.
We love our kids, but by letting them rule only hurts them more, besides you, and the future can be shaky.
Lots of luck with this.
Take care,
DE