Answer & Explanation:
The tone of this example is "Sad and remorseful" as indicated by the words "tearfully" and "wishing she could think of a way to make things right again". These words suggest that Keira is feeling regretful and sorrowful about something that has happened and is struggling to find a way to make amends. The accusatory look from her sister also suggests that there may be some conflict or tension in their relationship, further contributing to the sad and remorseful tone of the passage.