I want to believe in Sena healing. If the memories of the good times she had with her sister are painful, rewriting them is generally something you would be advised to do. The fact that she reached this solution, by herself, and is taking those steps, no matter how small they are, is reassuring and quite heartwarming.
At this point, I'm more interested in the healing process of Sena than in the ship. Whatever the end goal is for this manga, I hope to see a genuinely happy Sena.