It was interesting to read how others here take to the style. Its like song lyrics I have read while listening to the particular singer. If I " listen " to it, I arrive. What I mean by this is, when someone is reciting a story or tale, or singing a song, its different to reading with 'our own' mental voice. I think this is Dickinson talking in her style.
A woman, elating the beauty revealed since the arrival of Summer. She has moments, flushes of high inspiration, fleeting and about to stay, but don't, can't quite. The Squirrels take these things, as is their nature, until the scowl of Winter and snow arrives again to protect what belongs to nature. Then, she knows, for only in her grave, no more Winters needed and she will enjoy without interruption.
The very last words seem like throw aways. Not sure I described it so well.