So tell her what the consequences are to crossing your boundaries and then ENFORCE THEM.
Puppy is right. Stop financially enabling her to carry on her A. Turn off the internet access and anything else you pay for: her cell phone, her car, insurance, gas, etc.
By funding her extramarital activities you are condoning them. If I was having an affair and my BF knew about it, told me to stop but did nothing about it and still cuddled me in bed at night of course I wouldn't change anything. Why? When someone can have everything they want they're not going to voluntarily give that up.
If you love somebody, set them free. http://tinyurl.com/2empx2g