Do you have other books on your account that she might like? If so then I am sure she would prefer the convenience of easy access to the archive then having to register and deregister all the time. I am assuming that the two of you can work out a way to deal with paying for each of your books.
My Husband does not read much but if he did we would share an account. I don't care if he knows that I read the occasional erotic novel or if he did the same. Other then that we have similar tastes in books (when he does read) and we share our money so I don't see that as being a problem.
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