I'm gonna be 100% honest here.
it sounds like your so far in the friend zone, you cant see the way out anymore. so you have to make a choice here, fortuntaly her acting like this gave you a nice window. you have a few choices:
1. try to fix it and still be friends
2. try to get out of the friend zone, and more into a physical relationship instead of a plutonic one (just friends)
3. completely bail on that shit and move on.
if you choose to try to fix things and just be friends, chances are you will never have a real relationship with her, and you will stay friends and only friends with her for a long time while she dates other guys. so if you think you want to have a relationship, dont try to be her friend, try to progress past that and show that you want a relationship or nothing else. option 2, basically what i just said, but im not going to get into the details on how to do this, it would take way to long and im a lazy bastard (look it up though if your interested). option 3, bail. here's the thing, trying to jump from the friend zone to the boyfriend zone can take a while, and alot of effort, depending on how much you like this girl, and how much she likes you, you may want to cut your losses and move on to another girl (note: dont become just friends with that one lol). this is the thing that might help you, theres always another girl, no matter how much you liked this one, you'll find another one if you try. from what you've said it looks like this girl is treating you like shit, just cutting off all communication, but here's the thing, thats probably because you're in the friend zone and she sees you as needy. which is why she would do this and not feel bad. the other hook-up theory is a definate possibility also. so its totally up to you, but make sure you arent wasting your time on something that wont be worth it in the end.