She Ran Away

I made a post about how my ex lied to me about my daughter being mine for 15 years. I haven't heard from her in two weeks. Last night my ex called me askkng if she was with me and that she ran away. My ex said the reason she ran away was because she was mad she had to share a room with her boyfriends brother. Hes 29 and she is 15! My fiance said if she shows up at our house we have to call the police or we'll be charged with kidnapping. According to my ex she left her phone behind but took all her clothes and backpack. That doesn't make much sense to me why she would just leave her phone. The police are involved and I think they think I have something to do with it. I haven't even heard from her for over two weeks. Idek what to do if she does come here or if she will. I know I have to call the police if she does. It just hurts that she may feel betrayed by me if I do that. Idek if she will show up here though. My fiance has called the friends she has in our city to see if she was there but so far nothing. I've been worried. Have any of you ever ran away or had kids that ran away? Idk what to do, and there isn't much I can really do. She's not the type to do that. She's a good kid. Idk where she is or what she's doing. We have her friends and her parents on a look out. I feel helpless that I can't really do shit besides wait. I've driven around but even if she did run away here it would take her a few days on foot.