Obviously Carole wasn't performing voodoo rituals or trying to 'Get Out' William into marrying Kate against his will. He met her, decided he liked and fancied her, dated her, fell in love with her, and eventually married her. But I don't understand the resistance to the idea they might have considered the possibility of Kate marrying him, or tried to engineer a meeting just on the off-chance he'd like her, when so many other girls did.
It's really clear that Carole raised her girls to prioritise marrying rich, titled men. Neither of them ever really worked or pursued careers (well Pippa is now which I actually really admire about her), they were notorious for being the most aggressive social climbers on the circuit. Tons of girls chased William or tried to engineer situations where they might meet William in the hopes of possibly becoming queen one day. Why are Carole and Kate held as being above all that?
William's university saw a big increase in admissions at the time, I went to St Andrews a few years after they left and heard so many crazy stories, that there were always girls visiting who didn't even go there just to try to meet him. One of my best friends now is Prince Andrew's ex-girlfriend's daughter at the time so I have a peak into that world, and so many girls tried to put themselves in William's path in the hopes of marrying him. Kate wasn't the most extreme but she pretty clearly did go to at least some effort to put herself in his path.
William did his gap year with a charity in Chile (he had TV cameras following him so it was well-known that he was there and which charity expedition he was on), Kate signed up to the exact same one and flew to the same village in Chile just a few weeks later, the exact same charity, same town, same programme, even led by the exact same person. She applied to and accepted a place at Edinburgh when all the press were reporting that William was going there, then dropped out of her uni place and re-applied to St Andrew's when news came out that he was going there instead. She became his housemate which doesn't just happen by accident. And the infamous catwalk incident where she removed the sweater part of her modelling outfit and decided to wear to pull the sheer skirt above her boobs and wear it as a dress instead. Getting hired for a modelling job and deciding to drastically alter your outfit to be much more sexy and revealing than what the designer intended is a pretty brash move. Like come on of course she was pursuing him and trying to catch his eye. But she wasn't doing anything a thousand girls did.
People act like of course Kate can't have pursued William because her chance of success would have been so low, like it was some huge gamble that happened to pay off, but what gamble? Girls from that background (or at least, the background Carole aspired to) are expected to go to university but they're not really expected to have proper careers so it doesn't really matter what university they go to or what they study, as long as it's a "posh" uni. Even if William hadn't been interested in Kate, pursuing William would have introduced Kate to lots of other eligible aristocratic young men. It's not like Kate was going to be a neurosurgeon but gave up medical school to chase William. If she hadn't married William she probably would have wound up marrying someone else in William's circle or some other posh rich man she met at uni, so it still would have paid off. A lot of posh girls only go to uni to husband-hunt, why is Kate considered so pure and special that she's the exception?