Hiya!
Sometimes when the levels drift up towards evening it's because the basal insulin is running out. If you only do one injection of basal a day, it might not be lasting the full 24 hours - Levemir is particularly prone to this although some people find the same with lantus too. I split my basal dose and take some in the morning and some in the evening to make it last the full day.
Also, the easiest way to reduce the HbA1c is to stop pushing your blood glucose up in the first place - that means reducing carbs. All carb turns to sugar and increases BG, so if you eat less of it, your BG doesn't rise as much. If your girlfriend eats lots of potato, rice, pasta, bread, cereal, she could reduce the portions of those right down - it makes a big difference. Unfortunately, DAFNE leads us to believe that we can cover carbs with insulin and eat what we like - it isn't as simple as that though and you make your life a whole lot easier by reducing those carb portions.
Smidge