Honestly it's probably best to wait to handle her until she has had 3 consecutive (no refusals) meals with you. Ball pythons- especially young ones, tend to get stressed out easily. She is still getting used to her new home. Handling before she is regularly eating could lead to meal refusals.
After she is regularly eating I recommend handling her 3 times per week for about 5 minutes each. Don't handle the day before, the day of, and the day after feeding.
Trust me, I know waiting is hard but keep in mind that 3 weeks of no handling is nothing compared to the 20 or so years you will have with her! I waited to hold my ball python and it was worth it because she is a fantastic eater and very easy to handle. Let us know if you have more questions!