To me it really depends on how much you are wanting to spend. I have known inexperienced painters who have done an excellent job. As long as they have done it before they should not have a problem. If she chooses to do it her self, then she may want to consider these facts. When you paint you have to paint evenly to ensure the coat goes on right. Primer the walls if necessary, and be sure not to paint over a wet area as this can cause the paint to be thinner, unless you plan to paint two coats of paint.