She knew the stairs creaked. She couldn't imagine climbing up the drainpipe, though. She put a careful foot on the first step, tested her weight on it, but sure enough, a creak began. Could she float up the stairs? If Great-Grandmama heard her she might as well be a ghost.

Excellent! But that Great Grandmama sounds scary !LOLZ but yep...sneaking in must imply there was a sneaking out to start with!!!
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Imagine a ghost in stairs at night, it's terrible
Imagine you put your foot in stairs and it floats
beware the great-grandmama 🤣