Sad to admit, but this is the reality nowadays. 
If the
girl/guy is really desperate for the money and the other party is
not third-world ugly, then yes..the girl/guy might just chose money
over love.
Don't blame her for what she did, sometime when you put yourself in
her position, you will be able to understand her decision.
I'm sure that she will also wish that you will find a better girl
than her who will make you happier. Which of course you will...in
due time.
There is nothing more else you could do at this moment except to
support her decision and wish her all the best to her life...you
also want her to be happy right? And if her decision is going to
bring about the most happiness to her, will you still support her?
I'm sure you will if you really loved her.
Good luck and time will heals everything. 
