The pale comb is normal with molting birds--it will get red again when she begins laying once more. The weight loss isn't the unusual, either, as molting is hard on chickens and can cause things like that. But just to be safe, I would worm her. Good broad-spectrum wormers include Valbazen, SafeGuard, and the Worminator (flubendazole). Wazine and Ivermectin are sometimes used, too, but they are rather ineffective. Most wormers can be purchased at a livestock supply store, or you can order the Worminator (which is what I use) from here:
http://www.twincitypoultrysupplies.com/store/index.php?main_page=product_info&products_id=584
To help your hen through her molt, you can feed high-protein foods like scrambled eggs, mealworms, and wet cat food. If you want to get some weight on her, fatty, high energy foods like corn, other grains, and bread will help. Vitamins in her water would help strengthen her, as well.