Hindu & Christian war

I love her lot and she loving me more than dis world.....now her mom is not Agree for marriage bcos caste religion and health issues....her mom got 1st attack when she was forcing her mom for marriage...thats y she is ignoring me now a days....I m afraid of missing her even if I have hope ..I can't forget her pls help me asap...I m very depressed.We r in relationship more than 9 years.I m Hindu I m ready convert into Christian and from my family all ready for marriage..her family like Me ..bcos of love matter they r very angry on me ..I tried everything to convince her mom but all were wasted...pls give me ideas to convince her mom pls pls