What other data could help Emmeline decide if her blogs were helping her achieve her goal of selling more Breakfast Boxes online?

The most useful data is whether blog readers complete a purchase for the specific product the business wants to sell. In Google Analytics, an action that matters most to the business can be tracked as a key event, so the best measure is the one tied directly to that sales goal. Google also treats purchase as a recommended event for online sales, which makes it the clearest signal of whether the blogs are helping drive the intended outcome. A product-specific purchase measure shows business impact more clearly than broader signs of interest or general shopping activity