To find the loss each day, we need to divide the total loss by the number of days:
\[ \text{Daily loss} = \frac{-624}{13} \]
Calculating this gives:
\[ \text{Daily loss} = -48 \]
This means the doughnut shop lost $48 each day.
From the options provided, the correct choice is:
\[ (-624) ÷ 13 = -48; \text{ The doughnut shop lost } 48 \text{ dollars each day.} \]