You can get new employment letters for your wife and include on the job(s) she's claiming points for. Just include a few job durties that match the duties of the NOC code and keep it as simple as possible.
The review required on your eligibility is what is likely responsible for the delay you've been experiencing.
I’m not sure we could improve the letter we have already submitted. The agent notes in the GCMS read that the letter the letter is dated and on headed paper. They also note that each individual role description requirements meet the NOC we are claiming points for, and they do a little calculation to show that it all adds up to more than 3 years.
The organisation is a large local government organisation in UK, which employs thousands of people so it should be pretty easy to verify they exist, and all the work was as a front line social worker, with points claimed for the Social Worker NOC.
Aside from my wife’s lunch preferences, I genuinely don’t know what additional info we could add!