I recently took a class in handcoloring, and this was my first landscape, done in class. The print was made by the instructor (terri) and is 11x14 made from a 4x5 negative & printed on Kentmere semi-matte fiber. I did have to scan it in two parts & stitch it together, but I did not do anything else to it (as evidenced by the goofy stitch line). :)
Wolfeye, you will want to try to flatten the prints, but not mount them until after she has painted them. Check online for info or at your local library for some books on the subject! Good luck to her! (Buy her some cotton balls & toothpicks, too!)