My wife is diabetic, we didn't drink, my wife controls her blood sugar through diet rather than drugs, lately her blood sugar was creping up in the mornings, she has started having a glass of wine with dinner and it has help her blood sugar.
Beware about your wife being prescribed a sulfonylurea, e.g. Diabeta, Micronase, etc., in the future. Alcohol and sulfonylureas don't mix.