I don't think she has ever used one, and probably doesn't even know how to paint digitaly..thus she is AFRAID of what she does not understand. It is a tool, but so is a brush, palet knife,..etc.
I sell digital paintings on giclee prints all the time. In fact most illustrators and fine artists are using these tools.
But, you will always have people who want "originals" and in that case, a good ol' canvas and paint would suffice.
Digital painting is a great way to figure out you colors and composition, and then paint it on canvas later. Your creative process is not hindered with cleaning brushes, waiting for paint to dry, or ever running out of paint!!!
"If one advances confidently in the direction of
his dreams, and endeavors to live the life he
has imagined, he will meet with a success
unexpected in common hours."
- H.D. Thoreau