Was wondering if she was in breeding mode , because Reggie is hot to trot and is always trying to mount her , and has succeeded .. At first she was fighting him off , now it seems she is giving in..
Brown cere indicates breeding condition - generally. Some hens will have a brown cere all their lives but show no interest in mating.
We are not Vets, Avian or otherwise. If you have any serious doubts about your budgies' health an appointment with an Avian vet should always be your first point of call.
