Is 153.6 an unhealthy weight for a 5'2" and a 1/2 14 yr old female? any tips for how to lose 15-20 lbs in 2-5 months?

Try lose 1 oz a day: Helpful weight loss diets have natural foods that take time to chew but contain few calories. Examples include carrots, celery, and leafy lettuce (little or no salad dressing). When shopping for fruits, buy small ones no bigger than a tennis ball, because fruits have sugar. Drinks without calories include water and green tea. Surely avoid sugar and simple starch calories. Eat LESS than before.