Why is Sarah counting down to Christmas in insta. Woman has a problem!
I think by this point she just likes Christmas because it's an excuse to buy even more. She can start buying now, put things away never to be seen again, but it's ok because she can say it will be for Christmas.
She maybe used to enjoy Christmas when there was a build up to the children finishing school and they used to go to some fun places. But now they don't do anything different. They don't really have any traditions, they don't even use most of the same decorations because she always wants whatever she finds in B&M. They don't even do any kind of "decorating for Christmas" kind of vlog, it's just Sarah pointing to a new piece of tat behind her that she put up at some point. They don't do anything with family other than Jane and Steve. No one has any friends. No Christmas school events. Scared to go out in public to local events.
In reality when it gets to Christmas there isn't any excitement from any of them, they don't buy a single gift for anyone outside of the household. They even do secret santa for each other when for most people that is something associated with work, a group of friends or extended family, to avoid having to buy for every person. Not family members living together, who would usually be buying a gift for each other anyway.