Her - это судно, в английском языке предмет одушевленный.

текст с аккордами редакция моя

Es-Major

     Oh I thought I heard the old man say
(Leave her, Johnny, leave her.)
           Tomorrow ye will get your pay!
                    (And it's time for us to leave her.)
 [bad word] 
         Leave her, Johnny,leave her
                  Oh leave her, Johnny,leave her.
                         For the voyage is long and the winds don't blow
                   And it's time for us to leave her.

The wind was foul and the sea ran high,
She shipped it green and none went by.
 [bad word] 
I hate to sail on this rotten tub,
No grog allowed and rotten [bad word] 
 [bad word] 
We swear by rote for want of more,
But now we're through so we'll go on shore.
 [bad word]