What does it mean when a girl sends you something she thinks you’re interested in?

I don’t want to misinterpret what she sent, but out of the blue a friend of mine (who I also like, but we’re not close friends and don’t talk very often) sent me something she though I’d have been interested in. Again, we’re really not that close, to the point where we’ll text each other every now and then, but this is the first time she ever sent me anything she thought I was interested in, so I just want to set the record straight so I’m not confused.