my friend on blackberry messenger has been lost or something

me and my friend were just talking on bbm, and then suddenly her pin went off from my phone don't know how though, i did not delete her as we were talking yesterday and it was okay but today morning it just disappeared. i did not backup my phone or did not restore it, so is there any way i can get my friend pin back i only know the friend name on bbm, as i have forgotten the pin. please help me resolve this issue thanks

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