Ummm.... she told you she can't communicate????
Sounds like your little girl wants a little "space..."
I am sure she has Internet access, and she should have given you a mailing address in her home port where they drop all the mail for crewmembers and take it onboard the ship once a week.
And if she has a cellphone she can call you whenever the ship comes back to the U.S.
I am sure she is fine, however. She is in good hands.