I don't know if any of the following is relevant to the mystery or not.
There is a 25 year old Alice
Dobbie in the following 1901 Ireland census return, married, birth place Scotland, with a 6 year old Belfast-born daughter named Alice:
http://www.census.nationalarchives.ie/pages/1901/Antrim/Court_Ward/Hanover_Street/934579/When I tried to trace back to a birth for the daughter, the only speculative possibility I could come up with (given the story thus far), was the following illegitimate birth in 1894 for an Alice
Collins, to the same named mother:
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1894/02253/1847604.pdfWhen I tried to trace forward that daughter Alice to the 1911 Ireland census, the closest candidate I could find is the following 16 year old Belfast-born Alice
Dobbin, boarding in Belfast:
http://www.census.nationalarchives.ie/pages/1911/Antrim/Court/Trinity_Street/135731/When looking for a potential marriage for the daughter Alice, I happened upon a transcript of a church record for a marriage that took place in St. Patrick's, Belfast, on 31 January 1923, the two parties were Michael McAlister of 41 Upton Street and Alice
Collins of 31 Dawson Street, the witnesses were John Clarke of Monaghan and Susan Mulholland of 22 Nelson Street. What's interesting in the church record is that both parents for bride and groom were recorded. Michael's parents were recorded as Michael McAlister and Eliza English, both deceased. Alice's father's name was left blank and qualified as 'Deceased', and her mother was recorded as 'Matilda Collins Deceased'.
I also noticed the following 1900 birth in Belfast, which I'm struggling to explain away to other parents. It's for a Margaretta
Dobbie, born to parents 'Harry' Dobbie and Alice 'Colins', the informant present at birth was a Margaret Sanlon - who may just have been the birth 'handywoman' in that local area (the 1901 Ireland Census shows such a person in the vicinity):
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1900/02010/1772331.pdfThen there was the following 1904 death in Belfast of a 3 year old Maggie
Dobby, described as the 'Daughter of Henry Dobby Watchman', it took place in Nazareth House:
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1904/05621/4581272.pdf