The Arabella is kind of an average ship. None of her
stats stand out as exceptionally good or horribly
bad. You can take this to mean she's got nothing
special, or you can see her as a versatile ship that
can do just about anything.
If you want her to run gold, she needs a Helmsman
for speed. For fighting, she needs a Captain and a
Cannoneer. For boarding, she ought to have a
Helmsman and Musketeer. For any of these, a
2nd-action crew would be a valuable addition. Thus,
you can make her into anything you want, just by
adding the right crew.