Do you want to marry her?
Talk to a lawyer. It sounds like she is either inventing the pregnancy or if she really is (and you have no proof) that she does not know who the father is. You deserve proof. and should also get a DNA test before you go further with her. If the baby is from you, marry her if you want to marry her, but in any case be a man and pay for child support, but you need absolute proof from a lab that she is pregnant, and that the baby was from you. Don't marry her until you know that. (Unless, of course, you actually do want to marry her no matter who the father is.)
I can't tell where you live, but what does it mean when you say she'll "file a case against you"?
Hi. In the US, you'd be within your rights to ask for a paternity test before anything else could happen. Is that a possibility. What can she have you thrown in jail for? Until you know that child is yours, I'd say you don't have to do a thing--- especially marry her. You worry about her family's reputation but remember, they have no problem ruining yours. Marriage is complex--- don't get bullied into doing anything like that! The baby might be the other guys--- but it could be yours, right? Or are you sure it is not?
I'd let her know that you will take no action until there is a paternity test. Is that possible where you live?
It sounds like you have text messages or emails (however you have been communicating with her) that would indicate she's blackmailing you, and wants to marry you - not the behavior of a woman who has been raped.
As hard as this is, I think you should lay low. When her bf (best friend? surely not boyfriend) contacts you, act neutral and not aggressive. At this point it seems unlikely you could act surprised and deny having sex with her - you've been in too much communication to deny it now.
Sounds like a tricky situation. I agree with rockrose that you should lay low. I would not marry her. Blackmailing you sounds like something you should try to keep record of. Tape her when she calls and keep any written communication. Tell her that when she's had a paternity test, if it is yours, you'll decide the next step. Don't allow her to frighten you into a bad decision. good luck
She is living with or supporting a boyfriend and you are worried that something she says will ruin your family's reputation? Talk to the lawyer in the other city again if this is worrying you. She would not have a case.
If she is really pregnant, she should send you proof. Your lawyer can write her a letter to that effect.
Also, at least in the United States, lawyers are barred from telling tales about their clients. It might be that such laws exist in India too. Meaning, you might not need to be so concerned that if you consult legal counsel in your own city your family's reputation would be ruined.
Certainly don't give her any money in response to blackmail attempts. Write out a log of everything that has happened, in chronological order, and mail it to the lawyer you have consulted. That will be a record, and not accessible to her side in case of a legal fight because client communications are privileged.
I would also suggest seeing a therapist or counselor in the other city, just to have someone to talk to about all of this. It will help you see that the situation is more one of her conning you than you really having a serious issue.
Obviously if she is pregnant (and it really doesn't sound like she is) and if the baby is from you, you will need to pay child support. But the rest of it, a lawyer and a counselor will help you see, is all just bombast.
So. Her "boyfriend" is good with her trying to force you to marry her?
I really don't think I understand this situation.
patelpriyank, is there an adult you trust to tell this situation to - an uncle, father of a close friend, etc., who can help you make sense of this? Everyone here trying to give you advice are in the US, and so we're handicapped by a lack of information about how your court system and social/communities work. I think you need guidance from an older person who can help you sort this out - it's really hard for me to imagine she could get away with filing a rape case on you when you have proof that she's trying to blackmail you with marriage, and it's unlikely she's pregnant. And now she's trying to blackmail you for 6K for an abortion. I don't think you necessarily need a lawyer, you need someone who is older and mature.