False complaint of sexual and IT offences, deleted evidence, options?

FIR filed 3 month back by my GF with sec354D,419,420,506,500,509,66D,67A.She use to send me her nude pics,sexually excite and do sex chat forcefully.she use to do sex chat with saying that we will marry,so these thing is ok,but after few hour of her 1st attempt of doing so i have realised that this is not good ,so i told her not to repeat,but she use to repeat the same after 1/2 month and she is having suicidal tendency,crying so have to do those chatting with her.many times i thought to abort all connection and leave her,but she use to cry and say that i will not be able to live and will do suicide.few months earlier i have seen her sex chatting and nude pics sharing with other 2 guys and i have terminated the relation with her.now she filed an FIR.i had lots of evidence against her but her mom called me and emotionally blackmailed to delete everything and i have deleted every thing.now i want to know based on above fact and on what ground i can FIR on GF and her MOM. Thanks in ADV