Final answer:
Abigail travelled a total distance of 16 blocks, but her displacement is 0 blocks.
Step-by-step explanation:
The distance travelled by Abigail can be calculated by adding the distances travelled in each direction: north, west, south, and east.
Since Abigail travels 4 blocks in each direction, the total distance travelled is 4 + 4 + 4 + 4 = 16 blocks
It's important to note that this is the distance travelled and not the displacement. Displacement is the straight line distance from the initial position to the final position, which in this case would be 0 blocks since Abigail returns to her starting point.