I'm really sorry about that. My parents are racists as well, but unlike your friend, my parents don't get to dictate whom I befriend. I think you should understand that there can be a lot of pressure, and that your friend, unfortunately, has given in to it. With Asian parents (at least if they're anything like my mother), she might not have had much of a choice.
Yes, this could mean that you've lost a friend (at least until she feels she'a able to stand up to her parents), but it doesn't mean that her feelings for you were invalid. You were a friend, and she probably still thinks of you fondly.
I say keep the door open, she might return when she moves out from home, and isn't controlled so much by her parents.