She won't give me my phone back?

I let my sisters friend borrow my phone last week for the weekend. She paid me $20 and said she would give it back to me Monday. On Sunday her cousin tells me dropped it in the water so I say it's fine just bring it to me so I can get it fixed and then on Monday her sister and cousin tells me that she got it taken by her grandma so I tell her my "aunt" (which is really my friends mom) is going to go get it and they said that she can't go get it. So I tell them to that I'll buy them an iPhone just so they give it back and then they said okay buy her the iPhone first and be then she'll give it back but I don't think I should have to buy her an iPhone just to get mines back because it's mine. The girl is always posting on her snapchat and Instagram with my phone and she won't give it back. If I tell the counselors do you think they'll help? Or should I call the cops? Please help. I tried telling her to give it back but she won't.

IPhone 6s videos aren't loading - just a white blank screen?

I went to a concert today only to come home to most of my videos as blank white screens! The thumbnails are white and the actual video is white although the audio is working. I have other videos that are working fine but most of them look like this!
I'm so so disappointed… Is there any way I can fix it?

Iphone in sea water?

I accidentally swam with my iphone 4s in sea water since 1 month. I put it in rice bag for 2 days but it didn't help.

Is there any hope or fixing method?

I didn't backup my phone to icloud before damage, Can I restore the lost data?