Any one, you or your parents; going to her parents should be mentally prepared to take an insult from them. If you are not, then do not go to talk to them. If they behave in insulting way and if you are not prepared to take that, then it will generate bitterness in your relations.
If you are not in favor of running away, then it is a game of patience and firmness on either side. Who so ever keep more patience and show more firmness will win. During this waiting period both of you should be integrated and should not succumb to any pressure tactics, may be emotional or physical.
You can not wait endlessly. You may give dead line to them so that they will be pressurized to take some decision.
Caste and relatives can not be pleased, any way!