The purpose of life insurance is to allow a loved one to maintain a given standard of living following the death of an income producer.
If your wife died, would the loss of her pension, social security, and part time earnings have a significant impact on your life style? Note: Her IRA and 401k money remains intact for your use, unless she has willed them to somebody else.
Men tend to have greater retirement incomes than women, therefore there is a greater chance that her standard of living would go down if you die first.
You need to determine how much total income would go down if either of you die, and if there will be enough for the survivor to maintain a desired standard of living. If income is inadequate after accounting for reduced expenses and possibly smaller living quarters, then this a gap that can be filled by life insurance.
Bryan