I agree with Helen that pumps use fast acting insulin only, not to be confused with an ultra fast acting insulin which is another animal entirely.
CGM's, like the Libre or Dexcom, are good at showing trends: stable, rising or falling blood sugars, but sometimes don't hit the numbers correctly after being first inserted. Paramount you also have a glucose meter to do finger stick blood testing to verify the readings are reasonably accurate.
Not really necessary to freak out on occasional high readings that are not sustained over a long period of time. Dumping insulin will bring it down and I most always dose what the pump calculates. Pump will take into account the insulin that is in the body already so it doesn't overdose and cause a low glucose reading later on. But I find a 20 minute walk will reduce glucose readings faster then the insulin. When I see numbers going high I go for the walk.
I found when treating lows, I need to be on the somewhat conservative side. So very tempting to "eat the whole kitchen". Generally 15 carbs will raise glucose about 50 points. "Your results may vary". A glass of orange juice is more way than 15 carbs and then one will go high later on and get on the glucose roller-coaster.
This is not an easy job being a pancreas. And no one ever has an extended period of perfect blood sugars so don't feel bad.
The best to your wife and to you for be a good care giver.