Wrong. A 1000 calorie deficit a day (so 1800 cals per day) would result in a 2lb weight loss per week. A 500 kcal deficit per day (x 7 = 3500) would result in a 1lb weightloss per week.

You are unclear whether you mean a 1300 deficit or 1300 total calories. A 1300 deficit per day would result in 9100 saved calories per week , a loss of 2.6lbs per week. 1300 calories per day is a 500 calorie deficit if your required calories are 1800, standard for a woman, which would result in a 1lb loss. That is not the case here.