A few notes. A rope halter will communicate pressure to the animal better, while the flat one invites the camel to lean on it. The rope halters are available at equine tack stores. If she was going to be used extensively with the public or for trail riding, she could graduate to the nose peg for an even lighter and finer response. Some purist trainers may frown on the use of food in training camels.
Food is an effective and powerful source of reward, gratification, and comfort to the animal.
However, I never allow the camel to get pushy with food. I never want to be in an enclosure with any large animal unless they know to respect my space. Camels can be especially pushy and bouncy, and the bottle-fed ones in particular may not understand respect. If she doesn't move, tap lightly. If she still doesn't move, give her a smart pop with the whip on the chest.