She paints purely for her own amusement, not to sell her work.

amusement 是名词，由动词 amuse（使娱乐）加上名词后缀 -ment 构成。amuse 来自拉丁语，本意是"使分心、使愉悦"。amusement 指"娱乐、消遣"的活动或状态。