When marriage is on the brink of Divorce amount which was in hundred turn into lakhs as you said 5-6 lakhs.
As you said they asked but her mother can say she did`t thats upto you to prove. anyway find related judgment on http://mynation.net/docs saying asking money for house hold things or support husband is not Dowry.
no need to prove what you are, your last 3 lines shows how much you harassed husband family. and i am 101% sure you filled false case