Dr. Anukarna Singh
Change in place and isolation from mother can be very stressful, give the kitten some time to adjust herself in the new surroundings. Rather than forcing her to interact try to grab her attention with a toy, cats usually like things that are hanging or something which makes some sound. When you introduce the two of them please monitor to make sure the older cat doesn't injure the kitten. It'll take a few days to a few weeks for her to become comfortable.