My suggestion is to go to Walgreen's pharmacy, or any other local pharmacy, and purchase a product called "Primatene Tablets". This is a product designed for asthmatics, and contains 12.5mg of ephedrine.
I would then suggest that she gets a product called Vivarin, which are caffeine pills, at 200mg per tablet.
I would suggest that your girlfriend take no more than ONE Primatene pill, at 12.5mg per pill, along with ONE caffeine pill, at 200mg. She can also throw in a baby aspirin, at 81mg, if she wants, but what does the trick is the ephedrine/caffeine.
If your girlfriend has ANY pre-existing hypertension, or other cardiac problems, she should NOT take ephedrine, as it raises blood pressure and heart rate.
If, after two weeks of taking ONE 12.5mg ephedrine pill and ONE 200mg caffeine pill per day (only once per day, not twice), she is tolerating the effects, she can bump the dosage up to TWO 12.5mg ephedrine pills and ONE caffeine pill per day.
She should NOT exceed 25mg of ephedrine per day.
Back in the day, prior to 2004, you could purchase products containing 25mg of ephedrine. People got stupid and overdosed on it, blowing out their right ventricle. This is why ephedrine, and other pro-hormones, were banned.
So long as she follows a calorie-restrictive diet and exercises, the ephedrine/caffeine will work to supplement her regimen, but it is not meant as a replacement for an exercise routine.
As for what exercises she should do to burn abdominal fat, there are none. You can not "spot reduce", meaning you can't target specific areas of your body to reduce visceral fat accumulation. You must do cardiovascular exercise, which burns calories and fat throughout your entire body, and eat a diet that is calorie-restricted. This will take time, and there is no magic bullet that will burn abdominal (or any other fat) immediately. She is looking at a minimum of 30 days of diet and exercise before she sees any real results.
Good luck to her!
Good luck to her!