Inappropriate? Or am I just being sensitive?

Maybe I'm just being bitchy, but weigh in and tell me if this is as weird as I think it is:

I'm sitting at the CC's on Magazine, doing some outlining for class. It's early-ish, so there aren't that many people here, and thus many open tables in the back room. I'm sitting in the corner, using one table for my laptop, and the table next to me for my books, since I've got a bunch of crap with me. So I'm chilling, doing my work, and this girl comes, sits down at the table that I have my books on, and just...sits there. She flips her phone open and closed, pressed some buttons on it, but otherwise...she's just sitting there. I thought at first she was waiting for the bathroom, but people are coming in and out and she never gets up and goes in. She just sits there, at my second table, which is really close to the one that I'm sitting at. So I give her a couple of "may I help you?" sort of looks, which do nothing. Eventually, after about 15 minutes of this uncomfortable closeness, I start flipping the pages of my book a lot, hoping that she'll get the hint that, yes, I'm using this table, and get up and leave. Which she finally does. But seriously, I feel like her actions were sort of freakish and inappropriate. There were plenty of open tables! It wasn't like I was taking up an inappropriate amount of space. We didn't know each other. And she wasn't doing anything! Weirdo.

So, tell me, am I being excessively protective of my personal space? Or is she a big weirdo for randomly chilling at my table, not knowing me at all, and fiddling with her phone for the better part of 20 minutes, despite my rather obvious discomfort with her presence?