Since budgies have such delicate systems and this is definitely abnormal, I think it is something to worry about. As others have said, pictures would help us see if we know anything about what you are describing and a visit to the vet would be good!
Does she have any other abnormalities (not eating, runny/different droppings, etc.)?
I bet she is a beauty, and I hope everything is well with her and gets resolved soon!