You just got her. She'll need to adjust. Make sure you're offering a high quality chinchilla food, such as Mazuri. Most other foods are fatty.
Just be careful if you got her from a pet store, as pet store animals are typically prone to illness.
Remember first aid kits for chinchillas are going to be much different than dogs. It is much harder to comprise a first aid kit. They generally do not show signs of illness until very late on.