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Bluebellkit! She is not even an allegiances only cat, as the book she was born in doesn't list her yet, and she presumably passes away before the Vision of Shadows arc. She is only named on Kate Carey's blog, which is also where she is described as a white green eyed cat, and where we are told she is in Starclan. To me she more strongly fits into the unnamed kits category that Su Susanne ran for a long time, but this was information from Kate so it's secondary canon if anything. She did exist, but canonically all we know is she is female and Sister to Yarrowleaf and Beenose.