I Wonder (Musing Uncertainty)
2 related grammar points that express the same core idea - compared below so you can tell which one to reach for.
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かしら / かなあ
Musing out loud in ordinary casual speech.
～かなあ vs ～かしら: かなあ is the safe default for anyone: unisex, current, and neutral in tone. かしら carries a traditionally feminine and somewhat old-fashioned colouring, so it marks the speaker rather than just the musing.