Around last Christmas, she sent me a package of books she said she'd lend to me to read. They were mostly Doctor Who novels. I told her I'd be as quick with them as possible and she told me not to worry about it. She gave me her address so I could send them back to her (she's moved around a bit and is supposedly in Arizona now... I say "supposedly" because... well, I'll get to that). It took a bit longer than I'd hoped because, let's face it, there were 5 books in total and I had a lot going on with the family crises and all that. I finished them back in March and because I hadn't heard from her since New Year's, I sent her another email just double-checking that I had her snail mail address correct so I could send the books back to her.
She never replied. I even sent her a message on Facebook and didn't hear back. I checked her Facebook page again and it said something about her being in the UK. A few weeks ago I tried again and still no reply. Looking at her Facebook page now, the last time she posted something there was on March 1st. Since then, people have shared stuff on her timeline and she never commented or "liked" it, even things like birthday greetings.
I'm nearly at a total loss here. I don't want it to look like I'm keeping her books, but I have no idea how to get in contact with her. I was once in a conversation with her and another friend of hers on Facebook. This friend would probably remember me so I guess I could ask her if she's seen or heard from her at all. I've no idea what's happened to this girl. I hope she's not dead (terrible thing to say, I know, but it's weird how she seemed to suddenly dropped off the radar).
If you were in this situation, what would you do?