Oops, This Short Story was a Novel

I thought that I had a really good idea for my 2500-word short story for the Toronto Star Contest. But then that idea grew before my eyes and the little pebble expanded into a boulder. What seemed like it would be a small snapshot of a person's day actually turned out to be a long several months road trip. I'm now so deep into it that there is no way of hacking it down to short story length anymore. This is what happens sometimes with the creative process. You end up not knowing what you have until you start writing it. I'm excited to have another novel in me. But I'm less excited that I now need to come up with another short story for the contest and hope that one can be 2500 words.