Why does she act like I don't exist?

zimbo
About a month and a half a go I ended up staying at a female friends house after we had been to a party. On the way back to her place she was holding onto my arm and talking about loads of random stuff, when we got back to her place she offered to share her bed with me but as I wasn't drunk and didn't want to make things weird between us I turned the offer down and went to the spare room, around 10 min later she came into the room and climbed in the bed, but we didn't do anything.

The next morning we went out to get breakfast and on the way back she asked why I was trying to stay away from her as I wasn't walking close to her, when we got back to hers she asked me to leave. Since then she has blocked me from everything and refuses to answer my calls or text messages.

I'm kinda stumped to what happened, I've know her for around 4 years so I don't get why she would act like I don't exist anymore.
Why does she act like I don't exist?
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