yeah we did a lot of the stuff you mention too, as children.
I probably still would have preferred to be inside doing maths books.
Maybe the child just doesn't want to play with yours, but has other friends, and plays in different ways to yours. Or think of doing maths/reading/writing as play - for me, that's what it was. That's often what my free time would have been filled with.
You don't seem to grasp that the child might enjoy this and want to do it, rather than being forced, just because your children would feel forced. It's fine for you not to do it then. Just like it's fine for her child to do what she does.
Twinkl might be dull and uninspiring, but some children love it, too. I loved repetitive work at times, very satisfying to do, and I enjoyed making progress. I could make a lot of things imaginative, too, even if they might have seemed boring on the surface.
You or your children might not love academics in the same way as other people, but that doesn't mean they are wrong or narrow for doing so, just like your children aren't bad for not wanting to do any extra work. They're just different.