For a girl your size, maintenance would be around 2000 calories. To gain muscle, you would need to be taking in 2400-2500 calories per day.
Let's get down to macros.
Protein: Keep this high. 1.25g/lb, or about 185 grams daily. Sources include chicken, lean cuts of beef and hamburger, turkey, fish, low fat dairy, eggs and egg whites, protein powder, etc.
Carbs: GVT is an exhausting program and is highly demanding of glycogen stores. Your body isn't going to start laying down muscle tissue if glycogen is depleted. Don't let anyone tell you any different, if you want to put on muscle, you're going to need to be eating carbohydrates. To gain muscle, shoot for 2g/lb, or 300 grams per day, mostly from starches, vegetables, and fresh whole fruits. Sources include oats, rice, pasta, bread, quinoa, fruit, potatoes, and sweet potatoes.
Fats: Fats are not your enemy and are required for optimal health and performance. Flesh out the remainder of your calories with fats. Since you are aiming for 2400-2500 calories and 1950 of them are taken up by carbs and protein, that leaves about 60 grams of fat per day. Sources include: nuts, avocados, olive oil, cheese, butter, as well as the fat in dairy, meat, and eggs.
Good luck. Hope this was informative.