A couple of days later, I got a call with my quote. The fare was almost three times higher than the cheapest flight available on line, and twice as expensive as the best (length of flight, layover times, departure times) ones I could access myself.
When I told her that, she said she wasn't surprised - that Disney was locked into contracts with certain carriers and the fares were locked in. She said the prices I quoted her as what I had been seeing were what she expected for my airport and time of travel.