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Thank you!So buff has some very specific genes that are needed to create a fully yellow bird, and even then, they might have some black.
Buffs have e^wh/e^whCo/CoDb/DbCb/CbMh/MhDi/Di
Your hen could be heterozygous for e^wh, Co, or Db or missing those alleles entirely.
Therefore, your hen is a black tailed buff rather than a true buff.