Pheesa was a very good all around "interior" player in college. She was only drafted #6 her year, and behind Katie Lou because of questions about her ability to play the 3 or on the perimeter in the W. From a draft standpoint she was viewed as an undersized 4, or a 3 without a perimeter shot.
Katie Lou on the other hand did not have Pheesa's overall game, but with a great shot and 6-3 size, she would not have to make a positional change for the pros, and might have been considered a safer pick. Pheesa has excelled in that transition in many ways, in essence becoming a great 3/4. Improving her perimeter skills to be effective at the 3, and yet still being able to use her athletic ability and moves to score more in close than most scouts would have predicted, enabling her to be effective at the 4 as well.
Many players need to move down one position, both going from HS to college, and then to the pros. Some of those changes are more subtle, but others are major conversions. IMO the biggest adjustments are when an undersized interior player has to learn to play outside, and when a scoring guard because of their sized, has to learn to be a PG. Hailey Van Lith might be an example of the later, a very difficult transition at LSU, but looking like she was starting to get better in that position at TCU.