In-laws threatning to give divorce

Respected Lawyers, My wife and me are staying in USA since last 2 years just after our marriage. Recently she traveled to India 11 Sep 2017 along with a return ticket dated 27 Oct 2017. She was a working professional before her marriage in the same company with me and it was a love marriage. However she had to quit her job as the company didn't issued visa based on her designation. She quit job to stay with me without any pressure from my side and came to USA. Around 20th Sep 2017, we had an issue and a heated discussion on the fact that she was delaying her paper submission for her VISA extension which is needed to travel back. Since then my number is been blocked and I am not able to contact her. I called her dad and he mentioned she want to stay there and I should not disturb her. On emailing her why she want to stay back, she replied that I had mentally and physically harassed her for last 1 year which is absolutely false. I have all my witnesses and alibis here in USA. I consulted with my parents and asked her to talk and sort out things but she is not replying and her dad is saying she don't want to come in front. That very much proves that the allegations are totally baseless. Her dad is calling my parents and threatening to do a 498a which will ruin my and their life as well. Also they are threatening us with false demands of ornaments which was never there. She wants a divorce with false claim of physical and mental violence. Her dad is eager to send papers to USA to get me signed right now. I don't want to break this marriage for some stupid misunderstandings and I want to talk and sort things as I have done enough for her comfort. Most importantly, she is not coming in front and her dad is doing all the talking. Kindly advice on my situation.