Why should/shouldn't I ask her friend (I need everyone's opinion please)?

Maybe its peer pressure or maybe she needs a break from you ( alot of friends do that) Is she hanging out with new people? Peer pressure can cuause the best of friends to wonder about their friendship. My advise is you need yo be the bigger person and Call her on the phone or email her. You need to tell her how you feel. Maybe you dont know it and you did something that she didnt like but you might not have even known. Call her! Its better not to do it over the phone, Cause she can hang up any time! meet to go get coffee or something and talk it over!