Dear Hemant,
Your information is insufficient. Still I try to answer your question.
You said the police never found the offender. I assume that six years back rape happened. She filed the complaint informing the name of the accused (rapist). Police registered FIR. They tried to catch the offender. The offender ran away from the scene. Traced now by the victim.
O.K. Now, my questions are - How much time was taken from the time of offence of rape to filing complaint and registering the FIR. Whether the police had taken the clothes wore by the victim and bed sheets if any from the crime scene, at the time of offence and sent it for forensic examination? Whether the victim was sent for medical examination and the report was duly received by the I.O.? Whether the victim was presented before the MM and her statement was recorded under Section 164 of Cr.P.C. If so, she can approach the police where FIR was registered to arrest the accused and bring him before the court? If she does not get help from police, she can approach the court where FIR was sent at the first instance.
The delay is not caused due to your fault. Hence, it will not affect the case's verdict. If the accused ran away from the place, where he ordinarily resided, the court could presume his involvement in the offence.
Regarding social pressures and other things, the victim and her family are the best judges to decide whether to go for prosecution of the accused or not.