It worries me that you don't consider talking to a parent about this or a sibling. You need to talk to your family about anything that bothers you sweetheart.
I'm really glad that you posted your thoughts here. It's a great place for advice and I agree with the advice you've been given. In all likelihood, your friend has,, for whatever reason, neglected your friendship. If it were me, and a close friend went missing after our usual contact being daily or a few times a week, i would definitely drop by their home and check with their family as to their whereabouts., at which time you do have to be prepared that this friend may intentionally not wanting to keep in close weekly contact. Have you had troubles in your friendship that you're aware of? Is your friend dating someone special that they spend a good amount of time with (maybe they are busy). Friendships sometimes die down and friends can go separate ways. It doesn't mean they or you are not good people. That's why it's good to have many friends, and the ability to be open to meeting and associating with many people. If your friend turns out to be pulling away from you, take this as an opportunity to meet some new people. Don't let it get you down - and please, let us know how it goes when you finally do catch up with them, okay?
Hm. well, in truth, she really may just be neglecting to respond. She may be busy. She may be preoccupied. Something may be stressing her out. She may not feel as close to you as you think she is. Her means of communication you are contacting her on may be broken. Seriously. All of that could be true. Otherwise, do you know her parents? You could try to contact them just to see if she is alright knowing that if she is and the above things are going on . . . you might feel a bit silly. I'd wait a week and see if she responds later and keep yourself busy. The likelihood that something terrible has befallen her is small. and you'd start to see things in the news about her being missing if that were the case. good luck