Focusing on practical things like finances when she's running after passion and "true love" (she thinks) is NOT going to do anything, in my opinion.
If you're grasping desperately for anything right now, try something that will show her that her soul will be saved, not her pocket.
Besides, isn't her "lover" a rich man?
In her state of mind, she feels like she's taking a leap that is worth the risk. Especially if you haven't given her the love that she needs all these years. She feels she's leaving a place of empty anguish and going to a place of fulfilling love and intimacy.
To achieve the intimacy that I want with my husband, I would give up all of my earthly possessions and I would live even poorer than we are now. That may be her stance as well.
The only thing you can offer her is to become a MAN that can give her real love and intimacy. I would bet that nothing short of that will do much at all.