Once you have assessed the amount of time needed for schoolwork and other commitments, it's time to lay the activities out on the table. Begin with which activities Janet finds most rewarding. Write the chosen activities down on a piece of paper and ask her to number them by importance, number one being most important and number four the least. It's time to label each activity with approximate commitment times. For example, if Janet chose dance as her most rewarding choice, you will need to label the amount of time that this activity will require.
Most activities provide a schedule for the duration of the season.
If you don't have one, ask the instructor or coach. Let's say that dance requires two practices per week after school at one hour each and a recital every other Saturday for one hour. You've determined that for each one hour session you will need to arrive 15 minutes early for warm ups and it takes 15 minutes to get there and 15 minutes to get home. So you've rounded each one hour session up to two hours of committed time. Don't get too detailed, keep it fairly simple and round up instead of down on your times.