Your cooked chicken and rice has more water in it then her previous food. Water needs can vary--is she peeing? You can try adding some broth to her water for flavoring to encourage drinking. will she eat ice cubes? as long as you continue to feed her something as tasty as the chicken and rice she will continue to turn up her nose at her regular food. Try soaking her kibble in broth until it is mushy then adding it to the chicken and rice. Slowly increase the mushy kibble while decreasing the rice. Then start drying out the kibble until it is just dry kibble and chicken then feed less chicken. Once back on dry kibble she should increase her water consumption.