Im a little bit concerned about the behaviour of Cassie the little cat im looking after for the young girl, as you know she had 4 kittens last monday morning, all the kittens seemed to be thriving and putting on weight well, but ive noticed over the last 2 days Cassie is spending quite a bit of time away from the kittens and tonight she seemed to be biting the smallest one , and i dont just mean small bites, like putting the kittens head in her mouth and holding it down with her paw, ive had to stop her twice from doing this , she also is very rough with one of the bigger ones when cleaning it,not quite nasty but bordering, doesanyone have any ideas please