I agree with these sentiments. I'm so sorry about what you are going through mate. I could understand her saying she does not want to let her parents down etc. if she had not already commited to you but at this stage and marrying someone she claims has attacked her and yet her parents believe this guy over their daughter? Hmmn! Does not sit well.
I would encourage her to open up and honour you both by telling the truth. Perhaps she is trying to pressurise you to some action or perhaps she has another and its getting harder for her to continue with her ruse.
I think a trip out there at this stage could be unrewarding and upsetting, best to find out what's what first.
I'm sorry again! All the best.