I am sorry that my previous comment was attached to Ros' answer below. I hope that this is more clear.
I have been trying to trace David and Annie. When David;s father David Taylor married Annie's mother in 1894, the registration says that he was a widower whose parents were Robert Taylor and Mary Blaney m.s. Jack.
The bachelor cloth finisher David Taylor, parents Robert Taylor and Mary Blaney m.s. Jack, married Christina Gordon in Old Machan Aberdeen on 6 Jun 1868. Statutary registers Marriages 168/2 142.
On 8 Apr 1892, Elizabeth Taylor, 21-year-old daughter of David Taylor and Christina Gordon, married George Dickson in Dundee St. Mary. Her address was 38 Hill St. Statutary marriages 282/2 77.
So, whoever Annie's actual guardian was in 1918, the contact address was that of her half-sister Elizabeth and her husband. Perhaps they were the ones who moved to Winnipeg and the corrections on the card identify her new guardian as connected to her Stormont ancestors and correct George Dickson's address to Winnipeg. This might explain the curious writing changes in the corrections I mentioned in my previous comment.
Unless Annie moved to Winnipeg with the Dicksons, the best place to look for her might still be Dundee or Scotland in general. Hope this helps.