Duckbilling is common with the super forms of Cinnamon and Black Pastel, including the 8-Ball. Within the animals that carry only one of those genes it should not be a problem as the deformity is linked to the doubling up of the gene.
I would say it would be up to you on whether or not you wanted to purchase and breed her. I wouldn't, personally, because I do not believe in breeding "imperfect" animals, BUT that is a personal preference. Other people are perfectly fine with it.
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