I mean, she's abysmal but on a personal level she's had the stress of the Johnson downfall, a fairly gruelling leadership campaign followed by death of the queen and straight into this shitfest.
The mess is of her own making, I don't feel sorry for her but it must be a whirlwind and in her shoes I'd be crying every ten minutes and stress-watching the West Wing to calm me down (probably why I'm not PM tbh)
I don't think she's an idiot, you can't get a PPE degree without brains. I think people often underestimate just how clear and robust you have to be to be PM though, it takes special qualities. Being intelligent is not enough, you have to be able to balance arguments and make fine judgments.
By all accounts, this lot just bulldoze through whatever they feel like doing instead of testing their ideas and listening to opposing views. It's their arrogance that is the problem, not stupidity.