This is one that can easily vary from state to state, if the policy had any value. It also may be impacted by the language of her divorce decree or separation agreement.

If the state law says the beneficiary designation of an ex-spouse lapses on divorce, and requires a filing of a new beneficiary designation or language in the divorce decree, and thus there is no beneficiary, the insurance company would pay a "contigent beneficiary" if any, and if none, the deceased's estate in which case the money ultimately goes according to this Will or the laws of intestate distribution of his state.