Hi Kristy, QuickBooks has a sample company file that has a ton of data in it. It was designed for anyone to practice in to get familiar with QuickBooks. However, you need to be aware that once you log out of the test drive it does not save any work that you have done. This ensures that the integrity of the data is maintained. However, it is a great way to get a lot of hands on practice with QuickBooks Online. Here is the link to the test drive account:https://qbo.intuit.com/redir/testdrive.
If your sister has a QBO account, she can also access this link by clicking on the help button, typing in the key word: test drive and then click on the sample online company option and select the U.S. link.
Have a great day,