Pregnancy before marriage in Islam?

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Hello, me and my girlfriend had sex and now she's pregnant. Her family don't know about us. Last time she asked if she could get married they told her in 2 years. So she's scared of telling her family about us n that she's pregnant so she wants to have an abortion but I can't allow that. I know I have sinned on having sex before marriage but now I can't just allow her to have an abortion that's haram. I though of running away with her n get married and have the baby. But it won't be valid if her parent don't accept this right? I don't know wt to do I need a very good advice, she's really scared of her family (Pakistani culture) so she won't allow me to go ask for her hand.