Rachel is what you'd call a controllist.

"Remember when I was living in a motel back in high school?" Sam reminds her. "I was determined not to let anyone find out about it or let anyone help me out. As far as I was concerned, it was my problem to deal with and no one else's. And then Kurt and Quinn found out, wouldn't take no for an answer, did what they could for me... and it made things so much easier when I stopped letting my pride get in the way. So please, just let me be your friend and help you, and don't ever feel like you're hassling me."