EDITTTTmy sister is missing

3 months ago my sister messaged me asking if she can stay with me for a few days i was in another state so I told her not this week etc. She then told me she ran away and its cold outside mind you were all the way in conneticut so it was snowing around that time. She ran away from foster care because they finally found a home for her but far away. I was so worried. She went to her friends house deleted facebook and didnt tell me the exact place she was. 2 weeks later I messaged her no response almost everyday until march 28 we talked and again yesterday she still hasnt returned home police are searching for her and i feel like a cover up. they showed her picture on the news again yesterday saying she was possibky kidnapped her foster family is desperate to find her. She told me shes now at her cousins in another town what should i do guys also I did tell her to go bsck shes missing out on school shes only 16!! missing for 3 months smh... I was adopted when i was 2 months my mom had more kids after so i never lived with her or even have contact with our mom my sister writes me randomly so the police never questioned because im not in her life everday but i think i will call the tip line