Logan Domaille Guernsey HELP

[Apperley]

Clarice Eileen Logan, born in Vale Guernsey 1886, had two brothers and two sisters Edward, Julia, John and Amelia Domaille (born before marriage) Parents were John Robert Logan born in Castel in 1856 and her Mother was Nancy (Annie) Eugenne Domaille born December 1849. Have copies of census plus have copies of her marriage to William George Apperley in London. The library in Gursneys have been very helpful but cant not find her birth records to confirm my records, can anyone help with finding out just where in Guernsey her records may be or how she just appeared to get married!! She was real not an invention ha! She is my Grandmother. All the Family come from the Island so no reason why her records can’t be found, just stuck in moving further in my family tree, Thanks for those who may be able to help