How can one track down the ets left by her recently deceased husband?

A friend, a 60+ year-old woman recently lost her husband. He was in complete control of the finances. She knew very little about the finances. He kept numerous small bank accounts and life insurance policies. She was consistently listed as beneficiary. What is the most efficient way for her to track down all of her ets? Thank you all! (By the way, she learned her mistake and is coaching all of her friends to think ahead.)