Indicates uncertainty or doubt; 'I wonder', 'I'm not sure'.
The ～かしら grammar point is used to express uncertainty or doubt about a situation. It can be translated as 'I wonder' or 'I'm not sure' in English. It is primarily used by females in casual conversations but can be used by males in some situations as well. ～かしら is used with verbs, い-adjectives, な-adjectives, and nouns.