If you've only had the snake a day or two, she's probably still in the settling in phase. If you have your parameters right, give her about a week minimum without handling or much bothering to get herself squared away. If she seems chill after that, you can start SHORT (about 10-15 minutes) handling sessions. Also remember not to handle her for at least 48 hours after she's eaten, or you'll get that rat back in a rather unpleasant manner!