If she makes a serious step towards you, I say you should re-consider. She is a human being after all. She may be starting to realize the error of her ways and have no where else to turn.
Remember, being hard on people is not always the best solution. Sometimes people get worse because we are too hard on them.
It may be your turn to nurture and support her, if you want to. you can also direct her in the correct direction if you are not ready to involve yourself.
if you want to help her at all, you should - but respect her marriage.
