Chinese Goose

Hi all, I am after some advice . we have got 6 Chinese geese of one is a gander. I have noticed that one of the geese/goose which always had an orange nob on her beek has now got all her beek orange . she has been sitting on eggs for a bit now but ther beek looks a mess. it has changed quite radically. We have not got near her yet as there are 4 other geese sitting on the eggs. please can some one just give me advice...can a beek change so radically or is it a sign for something else.
we are wondering if water with cider vinegar can be given to them just incase its a sign of bing run down?
many thanks in advance
Jan 
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