<human>: Friend - 27 F - and i - 26 F - have been friends for over 5 years though we live in different cities we visit each other very often. 

Last month she came to stay for a while and was left alone in the house for several days without any one around. 

I've just found out from members of my family that they think she went through their things. They've mentioned that nothing was taken, but things were moved or seemed to have been used and put back without permission (like bathtowels, clothes, toothbrushes etc). I'd  noticed it with a few of my own things too, but had no conclusive proof that it was her. 

I have my suspicions that she may have been in my bed while I was out as well.

Over the years we've known each other she's never done anything like this before. She's stayed with us several times and we've not had any problems, but this is a gross breech of trust and privacy, and it honestly creeps me out that she would do this. 

But I don't know what to do. I don't feel I can bring it up to her without proof, but this deeply unsettles me. Especially when I've trusted her with so much.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: I think my long time best friend has been rifling through my things and using them without permission, even my bed. I have no proof, but what can I do?