Assumptions Get You Nowhere

So, I'm a little irked with my roommate right now. She went home for the weekend early. We only have school Monday and Tuesday of next week because of Thanksgiving. She was going to come back for classes Monday and Tuesday. However, I got a text a couple hours ago, asking if I could bring her some stuff that she forgot down here. At first it was just one thing, but about an hour after that, she added something else she forgot. I texted her back because I thought she as coming back Sunday night, and that she thought I was going home this weekend, which I'm not, seeing as it'd be a waste of gas since I'll be going home on Tuesday. I'm irked at this because it's like when she added the second item, she's automatically thinking I'll do it, even though I have not said yes. Granted, I might end up doing this, but that is besides the point. The point is, it aggravates me that she's just assuming I don't have concrete plans on Tuesday and that I can meet her anywhere to bring her her stuff. yes, we all tend to forget something from time to time, but the assumptions she's making really just-- irks me. Part of it being PMS (sorry for the tmi moment) but I doubt she would like it if the roles were reversed.