I found the TikTok she shared to be quite ironic. It was about how you can't wait for the toxic person to realise their behaviour before you can heal from it because your healing is your responsibility and not contingent on the other person's revelations. Also how finding peace and forgiveness comes from understanding that.
However all Gabby does is make passive aggressive comments, shares pointed photos/videos, and slate how bad this toxic family member is. That doesn't someone who is genuinely healing would recognise that behaviour in its self is not healthy.
We all have "toxic family members", sure some more than others and you have to do what you have to do to make yourself safe.
In Gabby's circumstance it's either don't go to the family home for Christmas, or stay in a hotel/Airbnb and only attend the dinner and leave when you want to.
But Gabby wants everyone else to isolate and ignore the one person she has fallen out with by either uninviting him (and making him leave his own home on Christmas day) or exclude him by coming to Gabby's instead.
What Gabby doesn't realise is her experience with her dad is not the same experience everyone else had with him. For example Jane must have seen something in him to marry him and have a family together. Likewise with George, he may have some fond memories with his father. As an adult child, you are allowed to disagree with your parent, it's part of having your own identity.
So Gabby shouldn't be sticking herself in other folk's business!
Gabby, I know you read here and I know I used a lot of big words but basically what I mean was your dad might be crappy but it would be sew cewt of you to actually attend heal instead of being a bit of a bastard on social media.