If the Kindles are on the same account you can download whatever you want from the Archive either on the Kindle or using your Manage my Kindle Account.
If the Kindles are on different accounts she will not be able to access your account. Which means that you cannot share books using the archive feature. So you will have to be willing to add her to your account, add books, and de-register her when you want to share books.
Personally, it sounds like a pain in the ass. I would say share one account and don't worry about it.
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