All cats are different, but it's very common for a cat to take some time to warm up to its new home and people. It could take a few days, a few weeks, or a few months before she feels comfortable and learns to trust you. In the mean time, just be patient and give her space. It can be frustrating because getting a new pet is very exciting and you want to play and snuggle and interact with them right away, but many cats just need some time to adjust before becoming your best buddy.
Jennifer and the kitties, Coda and Caligula