Why, exactly, should I be excusing you? According to the US Embassy in Mexico website (https://mx.usembassy.gov/death-of-a-u-s-citizen/) there is a process you go through to get what is called a Consular Report of Death Abroad (CRDA) which is not just a translation of the Mexican death certificate.
What I asked was for advice for someone who had gone through this process, which you obviously have not.
And for the record, I care enough about my spouse that if the process is going to be onerous, I would be willing to pay extra to make it easier to deal with, rather than as you suggested, have them go through the hoop jumping.
And for anyone else curious about this process, I just found this on the State Department's website. Apparently they email you a PDF file and you can print out as many copies as you need. So no, each copy will not cost you $50 USD.
Contains a digital signature of the Consular Officer and a digital seal of the U.S. embassy or consulate. This allows the Consular Officer to send the document to the next of kin and other legal entities by email, which is much faster than by regular post. The recipient can then print out as many copies as they need, at time of receipt or at any time in the future.
The above is taken from this link: https://travel.state.gov/content/travel/en/international-travel/while-abroad/death-abroad1/consular-report-of-death-of-a-u-s--citizen-abroad.html