Is the breeder just talking about coat length, or do they mean the landrace type of Farm or Scotch Collie?
The Farm and/or Scotch Collies I've seen have been quite different from your typical Collies. They look like there is a goodly dash of Border Collie and/or English Shepherd, and/or Australian Shepherd somewhere along the line. They've typically been smaller than Collies, and have a coat a that is longer than an Aussie, but less than a Rough Collie, and usually not as profuse as either breed.
If she just means Collies from working lines, I'd expect a dog that looks like a typical Collie, but with a lighter, shorter coat. Kind of like an English Setter from field lines has a much shorter coat with less feathering than a show line English Setter.