[QUOTE=Reaper1242;2539842]It would probably be easier to just burn the images to separate cds in that case.[/QUOTE]That lies in the eye of the beholder
If you’d install a (free) virtual drive software like DVDFab Virtual drive (or the already mentioned Virtual Clone Drive) your mother won’t need to grapple with discs at all.
e.g. you create 2 (or 3, i don’t know whether one of the install discs needs to be present when starting the greeting card app) virtual drives in DVDFab Virtual drive, mount the 2 Art CD ISOs. Then open settings and tick “Mount last image automatically”.
This way your mother has to operate nothing at the Virtual drive software at all.