Doesn't look like anyone wants to touch this one.
Whether people wish to admit it or not, I think most people are a little uncomfortable about interracial relationships. My wife and I have an interracial marriage. And my wife's parents had an interracial marriage. My wife's grandmother's dying words were, "Tell my granddaughter not to marry that ********** man." And I sometimes wish my wife had heeded that advice. Just kidding.
I'm kind of expecting one of those, "Guess who's coming to dinner?" moments in the future with my kids. But the race won't be an issue, unless it's one of my wife's people. Kind of kidding.
What will matter most is the person's relationship with God and if I believe they will be a good match for my child. But of course, when my child is an adult, it will be up to her or him.
It sounds like you and your girlfriend aren't independent enough to make relationship choices without the consent of her parents. And I realize it might be tough to accept. But it seems you've made the proper choice by letting her go. So just allow God to work His will.
I pray all works out well with you. God Bless!