Even if the essence of a document is true, it can still contain errors. Just because an item seems to have every detail correct,
there may still be factual or typographical errors. This 1932 obituary contains two minor errors–the age at death and the year of the marriage. The date of birth is consistent with other records (there is no birth record or family bible entry for her birth) and the date of death agrees with the death certificate.
Don’t assume that everything is right just because 90% of it is.
At least they used her name and didn’t just call her “Grandma.”