My mum cat was wormed last week, and spayed on Fri, yet is still eating loads and loads - how long should I leave it before I get worried, or think about re-worming her - no sign of worms, and now I have pretty much stopped her eating the kitten food, her stools aren't as loose and smelly? She isn't overly thin, does obviously need to put some on, and get her fur in good condition.