Hey tabby,
I'm really, really sorry to hear that...
About Chapman, have you researched deeply about their program? Have you visited the school? Talked to faculty or students? I think you should consider it very seriously before declining their offer, especially considering there are not many programs solely for editors (or are there? I might be mistaken here).
I'm just saying that because during the application process I really, really wanted to go to USC. Then AFI was the first school to accept me. I started doing some more research about them and by the time I started hearing from other schools, I was so excited about AFI that I wasn't even thinking about USC anymore. As it turns out, AFI was the only school that accepted me and now I'm really confident it will be the right place for me.
In other words, give Chapman a real chance to conquer you. If you're STILL not convinced, well, AFI is not going anywhere... Just try again next year!