Will you glimmer on the sea?
Will you fling your spear-head
On the shore?
What note shall we pitch?
We have a song,
On the bank we share our arrows—
The loosed string tells our note:
O flight,
Bring her swiftly to our song.
She is great,
We measure her by the pine-trees.

Explain who or what “She” might be.
Support your answer with evidence from the text.