If you have filed before your death -
The Surviving Spouse benefit will be what your benefit is with the exception if you filed really early (age 62), the benefit would be ~82% of your FRA amount (higher than your benefit).
If you have not filed before your death -
If before FRA, the Surviving Spouse benefit is the FRA amount
If after FRA, the Surviving Spouse benefit is whatever your benefit was on the date of your death.
If she files for the benefit before her FRA, the benefit will be reduced (and at age 60, reduced a lot). Plus before FRA, there will also be an income cap before the benefit is reduced further.
If you died and she had not filed already for her own benefit, there are two strategies for filing for benefits to ensure she has the highest possible benefit throughout her life -
Go to ssa.gov and establish her "my SS' page. She will see a record of her earnings reported to SS plus an estimate of her benefit based on that record from age 62 (or current age) up to age 70. However, these estimates assume that she keeps working at your current income level or above until she files for SS. So the actual amount may be lower if she leaves the workforce early.
If her benefit at age 70 is LESS than the "surviving spouse" benefit -
She would file between age 62 and the Survivor's Full Retirement Age (
https://www.ssa.gov/benefits/survivors/survivorchartred.html) for her own benefit. The benefit will be reduced and she will have an income cap until she reaches her FRA. But when she reaches her FRA, she will then apply for the higher "surviving spouse" benefit to continue for the rest of her life.
If her benefit at age 70 is MORE than the "surviving spouse" benefit -
She would file between ages 60 and her FRA a "restricted application" for the surviving spouse benefit (and make sure it is filed as a "restricted application"). The benefit will be reduced and she will have an income cap until she reaches her FRA. But by filing a "restricted application", her own benefit will continue to grow (just make sure it will be higher than the SS benefit by age 70). But when she reaches 70, she will then apply for her own benefit at the higher rate. Make sure that it is filed as a "restricted application" and NOT a "dual enrollment" - filing for her own/surviving spouse benefit at the same time.