Yes please do Littleham, because it really is :). She just needs to follow the website advice and be good, but she doesn't need magic.
Shooting, you've said that you were an undergrad at Southamptom though, haven't you? (sorry if that's wrong). And you've also said a number of times where you are now, which if I've read it correct is a very long way south of Durham (sorry again if that's wrong). So I'm not quite sure where the intelligence comes from, other than rumour, or generalization, which as you'll know can be dodgy. I'm afraid I simply don't buy the idea that any academic in the History department at Durham would agree that more than the odd very singular undergraduate rejects an Oxford or Cambridge offer for Durham. That doesn't mean that some wouldn't have been more suited to Durham, but the fact remains that the Durham History department is stuffed to the gunwales with Oxbridge rejects not the other way round.
Also, without wishing to be in any way confrontational, I'm really not sure that the experience of your DDs' peers is peculiarly valuable, even if their schools do send several, or plenty, to Oxford and Cambridge each year. The Oxford and Cambridge stats show the gender balance for History which really isn't extreme.
I can say with no risk of libel that in my day undergraduates could be disappointed of their expectation of a history lecture because the tutor called in sick when in fact he was in the smart local hotel with his arm around a comely second year undergraduate. So much for good teaching :) (I was the undergraduate who spilled the beans, having taken a short cut from the river to the lecture room in the icy weather through the said smart hotel. The second year undergraduate in question also lived next door to me and was having regular meltdowns about the affair :( ).