She says she hasn't seen me in a while when it hasn't been all that long?

There's this girl I know and I like, though I'm not sure how she feels since I get mixed signals. One thing I noticed though is that if we haven't talked for like a week, the next time she passes by me, she'll say "haven't seen you in a while". The thing is, she HAS seen me in different classes, we just haven't talked. I'm wondering whether this means anything or if I'm looking into it too much, which I probably am.
She says she hasn't seen me in a while when it hasn't been all that long?
Post Opinion