Tilia:

I think it's about her not deeming the roommate "needy" or "worthy" enough for her charity.

I think you're right, and this strikes me as ridiculous too - especially since the roommate is just graduating from college and may have a legitimate need herself? Personally I was totally broke when I graduated and relied upon hand-me-downs from my working aunts to build a professional (if not exactly trendy) wardrobe without going into even more debt. I'm curious about what the LW has to donate as well. Most shelters I've been involved with don't really need the kinds of things a college student is likely to be giving away. I'm amused by the value she's giving to stuff that she's discarding.