What does "Yes, she’s the oldest ship of the American Navy." mean in English for Spanish?

In English for Spanish, "Yes, she’s the oldest ship of the American Navy." means:

Yes, she’s the oldest ship of the American Navy.

Listen to "Yes, she’s the oldest ship of the American Navy.": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 3, Level 3, Scene 5