can a person sue the U.S. embassy in kingston for inappropropriate behavior?

An embassy employee took the letter to my fiance informing her of her interview date and was upset after she wouldn't with him andheld the letter for 2weeks,she almost missed her interview date and never recieved the actual letter mailed by the embassy, only after he admitted having it he made arrangements to get her a copy ...she had to make arrangements without the appropriate documents or proper notice and it cost her the visa