The meds for diabetes can take a few tries to get right. I did. They start low and ramp it up as necessary to lower the blood sugars.
Diet is very important, but hey, reward yourself from time to time with a treat. Take a long term approach. If she's taking daily readings, don't make adjustments on one day's numbers. Look at it long term. Your doctor will see you periodically and take an A1C reading. That's really the gold standard. The daily readings you take are indicators, at best. I'm not sure they're that well calibrated, but you do get useful trends from them.
I never actually counted anything, but I lost 40 pounds and brought my blood sugar down from 250+ to where most days I'm under 135 or so. Diet and medications mostly. I don't get enough excercise, but nobody's perfect. On the diet side, I took a general approach to increase veggies and decrease red meat. Cutting out the brewskis will help a lot.
A lot of doctors will not distinguish carbs from one another, but I do. I love carbs, but....I go for low glycemic stuff-whole grains and I watch my fiber. You can get good fiber from green veggies, of course, but I like to get them from breads. I buy the more expensive ones when I can and shoot for 3 grams/slice of fiber if I can get it. No fluffy white bread. Pastas can actually be not as bad as you might think, as they typically have no yeasts and can be quite low glycemic. But watch out for the sugars in the sauces.
It's been an interesting journey for me. Best of luck for both of you.