Like Mistymoon, I also have 5 kids. And BOY do mine test me!!! After reading your posts, I suggest that you eliminate any physical discipline at present. You are pretty vulnerable and angry right now. You're right-attention is probably the reason she is acting up. I don't know about you, but in the process of quitting I become terribly self absorbed. Another adult that she can spend some time with would probably do you both a world of good (how about those older siblings?) I lost a quit recently during some stressful situations involving my kids, but, you know, it wasn't THEIR fault I lost it. It was THEIR fault for misbehaving, but not for MY lost quit. I have to take responsibility for that. It's always easier to blame someone else, and typically we turn to those closest to us. Nicotine is a drug. The courts often remove children from drug addicts until and while they are cleaning up their act. Withdrawels, physical and psychological, are ugly. We don't act rationally and sometimes say hurtful things. You sound like you need a neutral third party to intervene. There is nothing wrong with asking for help. It is not a sign of weakness--it is a sign of strength. Strength that you know yourself and your limitations.
Enough of my soapbox. Prayers coming your way and lots and lots and lots of hugs!!! :)