Apparently Kate/William do the school run regularly. Apparently they have helped at coffee mornings, sales, etc when the school runs them. Small independent schools run a bit like families, everyone knows everyone else. That’s how it is, they will fit in very well at this school.
I think Kate has turned out to be an asset to her country. Of course she has help, she’s married into royalty. Thank goodness William didn’t marry the attention seeker Meghan. She wants the privilege, the perks, and the privacy (almost total privacy.) She doesn’t understand how it works with royalty whereas Kate does, not surprisingly since she was brought up in Britain, apart from a couple of years when the family were expats when she was a toddler.
Royalty may not be everyone’s cup of tea, but it’s better than the alternative (have a look at what’s happening now for example, and a hard think about it if you’re a republican.)