The missing fingers definitely says ocean goddess. But the main character has a caring role in which she quite literally grooms (Not in the negative meaning) her sister as a response to outside influence. Which screams angakkoq if we're looking at ocean goddess imagery. She herself isn't mutilated, nor does she provide for the town materially.

The dog connection is clever, but I don't know if she marries a dog in the inupiat version of the tale. Tbh my only knowledge of the tale is as Arnaqquassaaq.