Katniss has recently spent 4 days in the vets due to constipation and not eating. I love my little girl and don't want this to happen again!! She is only 4 months old. What are some good food choices?? Right now she eats Purina kitten chow and the occasional 9 lives canned food. She also loves her whisker lickin' treats. Keep in mind I am a new cat mom so any and all advice is greatly appreciated !!