Excellent finds, maddys52
Going back to TreeSpirit's post #12 Sybil Crase writes to newspaper "Auntie Nell' in 1914 giving her address as 177 Hay St, Subiaco. TreeSpirit has also found 1915 Directory lists: “Douglas Mrs, M. 177 Hay st. Sub”
According to electoral rolls 1914 the Mrs M Douglas at 177 Hay st, Subiaco is actually Mary Elizabeth Douglas, the mother of Edith Annie Douglas/Forster/Crase.
I'm beginning to think that Edith Annie is the mother of Sybil and there are some events which may point to this.
Edith Annie Douglas, born 1876
Edith Annie DOUGLAS, 418/187, registered REDFERN,
parents: James Bryan(t) DOUGLAS, Mary Elizabeth (nee CARNE)
Edith Annie DOUGLAS married George F FORSTER, January 1, 1896 NSW
Their child Sybil G C FORSTER dies 3 Jan 1901, and the entry for her burial suggested that this child was aged 0-1. I cannot see a birth for this child.
Edith and George's divorce was mentioned on TROVE in November 1899; the petition stated that Edith had deserted George.
https://trove.nla.gov.au/newspaper/article/14228366Edith and George's decree absolute was reported in the SMH 24 January, 1901.
https://trove.nla.gov.au/newspaper/article/14371791 Thus it seems possible that Edith had left George, perhaps in 1899.
In 1902 she marries Harold George CRASE in Perth.
Harold CRASE states in the report of his divorce case from Edith Annie
https://trove.nla.gov.au/newspaper/article/207405844that he had met Edith about 2 years before their marriage in 1902. So,
it would seem possible that Edith may have had a child 1900-1902 - whether, given the picture painted by that newspaper report, H G Crase was the father or not.
Just an aside - it's not unusual to find a child named after a previous sibling who has died so Sybil CRASE
may have been named for the baby who died in 1901.
I have done a bit of digging re Edith Annie's family and her childhood must have been difficult. For example, her brother Herbert was admitted to the Sobraon, (a ship that served as all-boy public industrial school) in 1894 as he had been found wandering the street - father out of work and mother living separately with 3 other children. There's some other information about her family and I'm happy to post if you want it.
With this background - IF, indeed it is Sybil's parents/grandparents it is not surprising that Sybil would not wish to speak about it.
Obviously this is speculation but seems possible.
Judith