New answers tagged onomatopoeia
My money's on onomatopoeia as well, as it's written outside of a speech bubble, like the sniffing sound くんくん and the gulping sound ごく, and it's in the same hand as those. We also see あー in this same format in the same panel as the little girl says 「あー！」. That being said, while しょわー sounds very effervescent, the illustration makes me think it's meant to ...
バン！/ ババン！/バーン！ is like "Ta-da! / Ta-dah!"
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