She did not join the 501st. One of the other build tips I should add. The biceps and forearms were much too large for her. Go to Lowe's or Home Depot. Ask for for a couple of the 5 gallon paint stir sticks, they are longer and thicker than a 1 gallon paint stick. After you cut the length on the bicep and forearm to fit her. Take the paint stick cut it to about 1 inch wide clap this to the edge of the forearm armor as you will need to make a new flat edge to glue. Then cut 2 pieces the same length as the part you need to bend. Clamp the 2 pieces on the forearm. 1 inside and 1 outside. Evenly place the clamps apart from the edge and each other. Then get a heat gun, hold the armor piece so the weight of the clamps will bend the ABS as it softens. Very carefully pass the heat back and forth along the full length of the piece to heat it evenly and slowly. As the piece begins to bend under the weight of the clamps back off on the heat.
If you have a few scrap pieces of ABS I would pretest the heating and bending if you are not used to this method. This will give you a good idea of how long to heat the piece before it will bend. Depending on your heat gun, start with a medium to lo heat. ABS melts at 221F or 105C.