You mean she isn't already? Well right now she is making headway. Hail to Frea, may she reign forever more. Surely there are much grander feats than making a giant warrior woman happy.

Deftness could be applied to other arts not just swordsmanship. Right?

After a time Brienne finally dunks her head beneath the water and come up to spout water. If it so happens to be in Frea's direction, so be it.