This question is incomplete
This question appears incomplete because of the absence of the value for the constant speed. However, there is a striking similarity between speed and velocity and the major difference between the two "quantities" is that speed is a scalar quantity while velocity is a vector quantity.
A scalar quantity (such as speed) is one that has a magnitude but no direction while a vector quantity (such as velocity) is one that has both magnitude and direction. Hence, velocity can be described as the speed in a particular direction (around a large circle as suggested in the question).
From the description above, it can be deduced that Kriste's average velocity is the same as her constant speed as she walks around the large circle.
NOTE: The unit for both speed and velocity here will be in m/s