A friend of mine was stressing out, and isn't responding at all... I'm kinda worried, help?

you should just ask her whats wrong. i think you should keep trying. dont think about anything except the fact that she is your friend and needs you. but that is what i think. your friends should come before your own thoughts and feelings. maybe i was a bit blunt, but thats how it is (if you really think she's your friend)