@LonelyBye reading your comment, I remembered at one point that Pauliana had returned to her family home after becoming a soldier, so I went to search for that chapter. In Chapter 3, Pauliana requested a vacation to return to her home briefly, and when she did, she came right before her sister's birthday celebration.
Returning home, while her sister was not nearly as hostile to her as their parents were, she acted rather disgusted that Pauliana had the nerve to show up, especially before her celebration. She even says "I don't want anyone coming into my mansion without telling me" and ordering her to leave, treating her as almost a stranger than her own sister. She seems to have eaten up all that their parents have told her, including that their home is meant to be hers, despite the fact that it is Pauliana's birthright. Ever since, she has not gone back home.
It's entirely possible that she could have changed her views, and quite honestly I'd love to see that myself, but my predictions of that in the current moment are quite low.