How many of you would financially support a healthy able-bodied daughter and let her sit on her arse for ten years waiting for a bloke to call so she'd be able to go running whenever he snapped his fingers? Surely most mothers would say, no, get a job, build a career, develop your own interests, don't let your whole life revolve around a man.
If I had a daughter who was trying to make a go of a job in London, but was being relentlessly harrassed by paparazzi and journalists (see the link below if you’ve missed this), making her life very difficult and her job untenable, I think I’d do exactly what the Middletons did, actually. Offer her a role in the family business, where she was able to put her creative talents to good use, and keep her in a far more protected environment.
And we can see that Kate did have her own interests and friendship groups, given we saw her taking part in a charitable dragon boating challenge and various other events after she and William broke up.