My girlfriend had 4 times abortion by tablets and now she has become too fat.help me what to do and how she can loose?she is 78 kgs now.

Probably not related: The weight she gained can't be attributed solely to taking medication to induce abortions. If she wants to lose weight, she will need to embark upon a program of diet and exercise. Various methods available to help her. Probably best for you to approach this subject gently/tactfully.

Losing weight: The two issues may not be related. To lose weight insure that calories burned > calories consumed. Drink at least 8 - 8 oz glasses of water /day. Try for 8 hrs of sleep/night. Aim for at least 5 servings of vegetables & 4 of fruit per day. Use whole grains. Avoid sodas, alcohol & junk carbohydrates. Get in a good mix of aerobic & weight lifting exercises.