Luke

Can someone please tell me how Charlie got back into the police force? I saw her resign out of guilt for telling brax where the evidence was and the accident with Liam etc.. i miss one or two episodes and next thing I know she is back in uniform! I have seen this happen many times with her since she has had this on/off relationship with Brax, although I have seen now even though she is back she is less discreet and not worried. Can someone please explain?