My cats don't touch the pigs. My one cat, Skittles, a fat calico, sometimes jumps into the cage and lays down. I think she likes the feel of the aspen. She hasn't done it lately though. In fact, I've only seen her do it once. My other cat is afraid of the pigs. He runs when he sees them coming. However, I've heard stories that cats have trapped, hurt, or killed guinea pigs. That's why you need to be careful. It really depends on the individual pigs and cat.
I would watch the kitten near the cage and see if she tries to go after the pigs. Watch when the pigs are out for floor time as well. Until you know more about her personality, and until she gets a little older and is out of the "playful" stages of a kitten, and is in the mature, lazy stages of a cat, you need to keep an eye out, and keep the cat blocked off from the cage. Either keep the pigs in a seperate room, or put a lid on the cage. They may turn out to be good little buddies, but you can't ever be too careful.