I really appreciate your open and honest response. It really makes me think about how much control I've let her have. The thing that is so screwed up with all of this is that if I do show "tough love" and made some kind of a threat like I'll throw her laptop outside, she would just tell me to grow up. And it's not like we have kids or anything for her to worry about finding out. Like I've said before, I just don't know what will reach her and actually have an effect on her to where she might actually stop and think about what she's doing.
I think you've read earlier about what happens when I've laid down boundaries. Her level of respect towards me has sunk so low that she doesn't even think twice about blowing me off. And I know part of that has gotten worse because of the couple times when I did blow up and threatened divorce on the spot only to back down. I guess I'm not very good at understanding what good boundaries and consequences are for us. And that's not helping.