Help supporting her through her depression

My fiancee and I had a great relationship...till wedding planning started. Her family is not as supportive of us getting married. Apparently an interracial relationship is fine, but not a marriage. She immigrated here 7 years ago. I figured it was fine, since her father and I go along pretty well, and while he was initally against it, we got to know each other well over the last 6 months while her brothers went overseas to visit family. Apparently there is pressure to make her conform and get a "suitable" husband. The pressure is primarily from her brothers who say is is a stain on the family reputation. I am African American, she is middle eastern. I thought we were past this point, as we've been together 3 years and she's been living with me for a while. This shouldn't have been a shock to them, but...well when she announced her engagement, there was an uproar. I told her to talk to her father directly, when he returns from vacation, and ignore everyone else. She is convinced they won't talk to her. Her brother, who returned 2 weeks ago, said some horrible things that I wasn't there to hear...and I want to go find him and bash his head in. Anyways since then she has been pretty depressed. She sits around all day, she won't shower, she won't do ANYTHING. I've tried making her feel better. I bought her a few gifts, I been working all day and taking care of the house myself. I bought her an expensive painting she's been wanting a while...nothing. We haven't had sex since...well...yeah. She is angry and confrontational A LOT. I got my head bit off for asking her to move her car so I could go to work as she was parked behind me. What do I do? She won't listen to me, she just keeps saying they are going to disown her or kill us. I don't think it will go that far. I told her if her father was going to disown her or kill me, he would have done it when he found out we were sleeping together, as losing her virginity was a HUGE thing. If he had a problem with, he would have killed me then. What can I do? We've halted all wedding planning, since she is in a shock. I doubt well get a suitable venue for next year. When I offered to wait on the wedding she got angry at me as said it was an insult to act as if I didn't want to marry her. I told her that wasnt the case but I was offered to wait until things cooled down. What can I do, she's been like this a month.

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