You said she came in to your life at 8.. Well, that is young enough to start with the fact of deserving respect if not as her step-mom, but as an adult in the home.. My hubby is the "step-dad" to my 2 oldest and they never treated with anything, but respect as dad and always turned to him when they were in need..
Even if you feel "I'm the step-mom, I can't do anything" :bs2: You are an adult and it's your home too... One problem I am seeing over the step thing with different people is, lack of backing from the biological parent in the home. You need to (if you haven't already) have a sit down with hubby and express yourself.. We had our sit down as soon as we moved in together and gave both sides concerning the 2 oldest and it's been good for almost 22 yrs..
Teen years can be hard with bloodline or without, mine were hell with all 4, but kicking your dog gives you every right to punish her..
Good Luck!!