I think maybe Sandy is talking about printing larger than the original painting, not enlarging the digital file, (scan or photo) of the painting. If that is the case then ya, you are fine to print larger assuming your file is high enough resolution. Even though I usually scan at 300 or 600dpi I won't allow my paintings, sketches or drawings to be printed larger than 200%, I think larger than that the pen, pencil and brush marks would look odd, but I've seen people here offering enlargements of their original art much larger than that.
Now if I'm wrong and she's talking about a digital painting then I'm not sure what 11" X 14" even means. The dimensions of digital painting should be expressed in pixel width and height.