Shopping’s friend: All I see here are flashing warning lights. That is NOT normal behavior and my heart goes out to her; I can’t even imagine what she is going through. Any female who says she doesn’t need friends and is pushing away her’s is most probably depressed(as SanityIsOverrated said). Especially is you’ve been friends with her before. I would suggest getting an experienced adult involved at this point as something isn’t adding up correctly.
Shopping: Hate to be blunt, and I’m not sure if I got the situation straight, but maybe get over your pride. Most people I know have a conscience and I bet your friend has been eating herself up over this, debating if what she is doing is right or not. Maybe don’t call her, but reach out to her in some way. Look, someone’s gotta make the first step…