I think she will respect and desire you more if you go.
I suspect you'll feel better about yourself if you go -- imagine not going, and how that will feel, all that weekend, and the months and years to follow.
What about being direct about it with her? Ask her gently if it really is the money she is concerned about, or something else. Tell her your thoughts about it being important for you both to get-a-life, tell her about the book you are reading, and how exactly this trip relates to your desire to grow and have a happy life...that you thought it would be a good thing for your relationship, rather than what it is turning out to be.
Some of the suggestions folks have made seem unnecessarily confrontational and punitive to me. This conflict is, possibly, an opportunity to increase your understanding of her and more importantly her understanding of you. It seems unnecessary and undesirable to go in a way that will leave her resenting you and *misunderstanding* the intent of your trip and anything else you do to GAL.
At least state your feelings honestly, and make it clear why you're still going to go, and make sure she understands it's not to piss her off or because you're a selfish jerk.
I agree with the notion you should take care of yourself first.
Seems like her reaction makes it impossible for you to NOT go -- it'll be worse if you stay home.
Sorry if you've addressed these thoughts already. I didn't have time to read your whole thread. Btw, have you read the Way of the Superior Man?
