I understand it’s a unique and unusual case. But I have taken care of since 2007 to present Yes, lived with her under the same roof and provided love and stability in her life.IMO you should be good.
The relationship with the birth mother sounds like it was severed a long time ago and you have been the sole primary parent for a long time now.
IMO the temp travel document would not have been issued if your case had a low chance of success.
Having said all of that, your case is not normal or usual - it's very unique. You should really hire a good Canadian immigration lawyer to support you once you are back in Canada and make sure you are taking all of the right steps.
I am the only parent she had for the last 13 years. We do have a great loving relationship and she is a young lady I am very proud to call my daughter.
Any good lawyers in the Toronto area please share with me.
thanks