Wait until your wife's blood sugar is stable to apply a new sensor.
Calibrate it several times when her blood sugar is stable. (Stable means not changing. I want to see a line on the CGM like this "-------------" not one that is going up or down.)
Make sure your test strips and CGM sensors are in date and have been stored at reasonably indoors temperatures.
Source: My wife and I both use CGMs. Our common medical issues were something we had in common.
Calibrate it several times when her blood sugar is stable. (Stable means not changing. I want to see a line on the CGM like this "-------------" not one that is going up or down.)
Make sure your test strips and CGM sensors are in date and have been stored at reasonably indoors temperatures.
Source: My wife and I both use CGMs. Our common medical issues were something we had in common.