It seems, your former fiancee has no mind of her own. She liked you when her parents told her to like you, and she dislikes you when her parents told her to do so.
Do you really want such a woman as a wife? Do you really want such a person setting examples, raising and instilling values in your children? Even if so, do you really think you can get along in marriage?
Answer these questions first. If it still seems worth it to you, I suggest you come up with an extra-ordinarily imaginative plan to convince her parents to make her like you back again. Exploit their weaknesses. For example, since you say they are only interested in money, perhaps you can gift her expensive jewels.
Anyway, since I am a stranger, I would be in no position to give you a proper advice....only how to go about it. Good luck.
-Anonymous