Keller and OTA
Keller wasn't usually a boat person, but this was something that was important for her to do. If she couldn't be with Iliana and Lady Hannah doing what she was bred to do, then being part of the group going to find supplies for the others that had been brought here was something that she could do.
She just happened to also have an extra edge in helping with what she was and she couldn't see not stepping up to give whatever assistance that she could.