Do you really think that it is financially smart for a organization to waste their money going after seminary girls and yeshiva boys?
What must have happened was that she probably gave money to someplace or signed up for something like a shiur or went to a seminar and she was put on a list, as he same that happens to everybody else. If you really want to figure it out, tell her to ask the other girls in her class if they receive the EXACT SAME mailings at the same time – if they all do then you know it’s from seminary – but if not then you know it’s from somewhere else.
And just remember, there is absolutely no chiuv to give money to a place just because they sent you something in the mail.
What do I do? I throw them out also. Occasionally, when I have some ma’aser money, and I feel that one of them is a deserving organization I might send them a few dollars. But before I throw them out, I try to open them and look at them so at least I know that klal yisroel is suffering and there are so many organizations and Yeshivos out there that are so desperate for money. That way when I am able to and when I’m ready to give tzedakah it makes it much easier to give.
I also feel bad, but there isn’t much more I can do financially. It is for that reason that over the past years, ever since I was in high school, I volunteered to help Yeshivos out if they need work done. That way they don’t have to hire someone. It’s the best I’m able to do.
Remember, while it might just be a drop in the bucket, when the bucket is empty you see every drop.