Dad's Dilemma: Daughter's 8k Rank - ECE Calicut or EEE Trichy?

Mam, I am in relationship with one girl since 2.5 year and my girlfriend told about our relationship to her mom. Every positive point of mine which told by my girlfriend to her mom but every point taken negetivly and denied to her.. Move on from relationship... Leave this relationship. He is not good boy.. The problem of her mother is the caste as well as I am Divorcee person and she is unmarried. We love to each other and want to marry. Due to her mother oppose, she is nervousness totally or told that she has no any idea what to do... How to do.. She is not sure she is convince to her family or not. She told that I don't know how much time she can servive to convince her family. Totally her mind felt like empty, dumb, nervousness. Her father not know about our relationship. When this type moment occurs she behave that sometime it is agree to make efforts for convince and sometime when she is nervousness that time she told that i can not convince and to do the breakup because she is not want to go against the her mom and family. But she told that also she want to marry with me. What should I do?