It is good that your wife’s A1C is improving.
Please remember that the Dexcom 7 is a monitor. It is NOT an insulin delivery system and as such it will “NOT keep her numbers down”. It is NOT meant to. It monitors the numbers to provide information for her & an insulin delivery system device (if she uses one) to make good decisions about insulin dosing (basal, mealtime and correction boluses).
In a previous text I did say that your wife would be welcome at Mayo Clinic Connect. It would be way better for her to see for herself rather than getting second hand emails from you on her behalf.
In the meantime how can Mayo Clinic Connect support you? You are the member. How can we help?