Final answer:
The nurse should express condolences and offer support to the client who recently lost her husband.
Step-by-step explanation:
The most appropriate statement by the nurse to the client at this time would be to express condolences and offer support. The nurse could say something like, 'I am so sorry for your loss. Losing a loved one is never easy, and I can't imagine how difficult this must be for you. Please know that I am here to support you in any way that I can.' It is important for the nurse to be empathetic, compassionate, and ready to provide any necessary resources or referrals to help the client cope with their grief.