The simple answer to this question is that Grete, who is the primary carer for her brother, Gregor, would like to make him more comfortable. She has noticed that he has begun to enjoy his new body and has been climbing walls to explore his room from new angles. On a deeper level, it is also possible that Grete has begun to accept her brother's transformation and would like to show this through her actions. The irony of the situation is that Gregor becomes distressed by Grete's kindness. Through changing his living arrangements to suit his new form, she is perhaps suggesting that he too must accept that he is now different. Grete's kindness towards someone with whom she cannot communicate properly, can be likened to a child's love and care for a pet. Grete becomes Gregor's only connection with the human world, and at first protects and nurtures him. As Grete grows into her womanhood through her family's increasing dependence on her, she begins to view this care as a duty of obligation, not love, and the obvious affection disappears from her actions towards Gregor. Grete is the one who suggests that the family would be better off without Gregor.