Katelyn would have turned eight yesterday.
The bodies were recovered from their home at 14, Whitethorn Close, on Tuesday afternoon.
The gruesome discovery was made by gardaí after the alarm had been raised by a neighbour who became concerned that they had not been seen since Sunday afternoon.
Assistant State Pathologist Dr Michael Curtis carried out a preliminary examination at the scene on Tuesday night and the bodies were removed to Letterkenny General Hospital where post mortems were carried out yesterday.
Gardaí said the results are not being released for operational reasons and they will not be seeking anybody in connection with the deaths. The post mortem on Katelyn is subject to toxicology results which will not be available for five to six weeks.
Gardaí found the bodies in the house after being contacted by a friend of Ms Innes who became concerned that she had not been seen since the weekend.
Local TD Dr James McDaid was called by gardaí to the scene and pronounced the mother and daughter dead.
The mother and daughter are expected to be buried in Bundoran, Ms Innes’s hometown, over the weekend.
Ms Innes worked as a secretary in McNutt Knitwear Company in Downings. Her daughter attended Scoil Mhuire Gan Smál in Letterkenny and had made her First Holy Communion on Saturday last.
In her native Bundoran Catriona’s distraught parents, Greg and Winnie Innes, were being comforted by family.
The second eldest in a family of six children, Catriona grew up in the Drumacrin Avenue area of the town. She worked as a waitress before leaving to start a new life for herself in Letterkenny with her daughter about four years ago. Her father is retired from Finner Army Camp.
It is understood that Catriona moved to Letterkenny after breaking up with her boyfriend, Katelyn’s father.