I haven't seen it so I can't comment on the painting, but unless the colors are very bold or the walls are really marked up, I think she would be better off making sure that everything is sparking clean, decluttered and well staged.
If your friend does not yet have an agent, we would be happy to talk to her. If she is interested, have her send an email to email@example.com or firstname.lastname@example.org, or call Tristan (my assistant) at 939-1307.
It is difficult to say whether interior paint will make a big difference withour seeing the house. In general, it does. And painting in neutral colors will generally help a house sell much faster. But the most important thing is properly pricing the home. Have your friend ask her agent (1) where the agent thinks it will sell as is and (2) where the agent thinks it will sell with the work done. Also, ask the time frame for both. It generally takes longer to sell as is, if work is needed, and your friend should factor in the carrying costs.