The situation is unique. Most of her clients have next to no experience with hiring or evaluating a Wedding Photographer, so price acts as a greater indication

The situation is unique. Most of her clients have next to no experience with hiring or evaluating a Wedding Photographer, so price acts as a greater indication of quality than usual. IF AT&T doubled their pricing for SMS (for example), they would likely lose customers, because we all have a better way of evaluating quality than just price.