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Eat chicken soup. Eat healthily. Exercise. Use a saline nasal spray. Get rested.
Chicken soup can do a couple of things to help girls get well more quickly. One, it acts as an anti-inflammatory agent and two, it speeds up the movement of mucus which eases nasal congestion and can help get rid of viruses. Also, it aids in keeping you hydrated. Healthy eating is a huge part of getting better more quickly and in staying better once you've gotten rid of your cold. This means avoiding sweets while you're sick: no soda, no candy, no ice cream, no dairy. Sugar is apparently terrible for your immune system. It curbs the immune system cells that attack viruses, which in turn keeps you from getting better quickly and staying better. Sugar can also irritate areas that are already inflamed (like your throat). Try to eat more of the brightly colored fruits and veggies like berries, citrus fruits, kiwi, apples, red grapes, kale, onions, spinach, sweet potatoes, and carrots and garlic. Exercise helps boost your immune system which allows it to better fight infections and viruses. Girls who don't exercise are much more likely to get sick (or get a cold) than those who do exercise. Exercise also releases feel-good chemicals and helps you sleep better, which in turn helps boost your immune system. Even when you're feeling bad because you have a cold, try for at least a 30-minute walk, or some yoga. It will help you get better more quickly. Saltwater rinses and nasal sprays break down the mucus that is congesting your nasal passageways and removes virus particles and bacteria from your nose. You can get something like a Neti pot at a health food store, or simply use a bulb syringe. Mix 1/4 teaspoon of salt with 1/4 teaspoon of baking soda in 8-ounces of warm water. Lean your head over a sink and gently squirt the saltwater solution into your nostril. Hold 1 nostril closed with your finger while you squirt the saltwater solution into the other and let drain. Repeat 2 to 3 times on both nostrils. Obviously, sleep is important to getting over a cold, but try to do calm, quiet, non-taxing things when you're sick. This way your body is less stressed out and more able to deal with getting rid of your cold. Even if you're not taking a bunch of naps, lying down with a book or watching some television can help you feel better.