Tried to delay the marriage but cancelled in end.

I had my pre-engagement (also called "Apnana") on 2nd July 2017 with the girl living in Delhi. In this event we gave 50K cash to her and gold necklace to her. I refused to take any cash or gift, I just took Rs 1 as "Shagun". I run a startup company in Noida, and we run out of cash in April 2017. We were a team of 25 people in January but every month we reduced and finally become 4 people (share holders only) by September 2017. We are not taking any salary since April. We had two choices either to file insolvency or build new product to recover. I could not quit so choose later option. Built new products by the end of September and realised that will take another few months to recover and generating revenue. So the crux is neither I have time nor I have money to enjoy marriage. Except I take help from my family, which I prefer to take for my business. In August they fixed the marriage date i.e. 11 December 2017 with my family. I rebel on it because I was doing so bad that time, nothing improved in business. I shared this with my fiancee on 2nd July. I have been talking to girl on this issue and finally shared the financials of my company that my company incurred loss of 35 lacs this year and I left with no money in September. I request her to delay marriage by 6 months from then, means to around March or April 2018. I met her personally and discussed about my situation on 14 October 2017. She asked me to wait till Diwali and after that she will discuss again on this issue. After Diwali (next day) I talked to her but she was stick to same date. I said I can't move further for 11 December. She sent 15 people at my home to put social pressure (it was so bad feeling facing them), I shared the same reason with them. Some how they were convinced and agreed for April, but her mother called my sister on the same eve that she is not ready to delay marriage, also she would say to society that you brother is having affair that's why he is delaying marriage. Her mother said, we are ready for 11 December but not after that and we have done shopping and bookings of 4 lacs. She said if it is not 11 December then marriage is cancelled. On 15 November, her mother again called my brother and said "We are asking for Car in dowry so that's why we are not doing marriage", in real neither me nor my family believe in dowry. It was so terrible and painful. Me and my family smelled something bad out it. We discussed with our family lawyer, he suggested us to send notice about the cancellation of marriage else she may call media on 11 December and say "See my daughter is ready for marriage but groom side did not appear because of dowry". We sent confirmation that we are not ready for 11 December and marriage can't happen, via lawyer. She replied to that notice with her lawyer notice mentioning loss of 10 lacs+20 lacs reputation loss+11K legal fees. Consumed our gifts as well. Not sure how to move further? Should we file civil suit? Please advice.