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Yes, you can @gather-ent by adding your sister as one of the users.
Let me show you how you can give access to her. Here's how:
Once done, have her check the email address you set up to accept the invite. She can click on Let's go! link in the email to take her to a sign in or account creation page.
For more information about how you can manage on who can access your books in QuickBooks Online, take a look on this link: Add, delete, or change user access.
In case you'd want to add your accountant in the future, here's a resource for your guide: Invite an accountant to review your accounting in QuickBooks Online.
Reach out to me if you need further assistance working with your QuickBooks account. I'm always here to help. Have a nice day!