It definitely doesn't mean the latter. I'd say it describes the manner of her walking. It's not entirely clear if she skips regularly or intermittently.
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AvangiPerhaps you could say that she "punctuates" her walking with an occasional skip.For some reason, I also picture her with her head held high, perhaps swinging her purse in a care-free nature.
CliveIt could mean a literal skip.But it could also be a figurative way of saying that she walked in a way that showed she felt happy and carefree.CliveI'm reminded of "Georgie Girl".