I don't think you'll find out in a weekend. We have the same situation - adult spayed female and a male kitten. We brought the kitten into the house at about 6 weeks old, and big cat had a snit for a week. She started coming around after a couple of weeks. Now it's two months later and they play all the time. Little cat had to go to the vet for shots a couple of days ago, and when he'd been gone about an hour big cat started following me around the house meowing. This kept up until mama and the little cat came home.
See #49. I think the fact that we won't find out in a weekend is the main reason why I've changed my mind.
If we end up getting a new cat, I want to see it before it comes home, to judge its personality and temperament. And I'm not thrilled about a long-haired cat, which this kitten is.