Well, you can just protect the pages. I assume that sysops won't go willy-nilly editing them. Obviously then she won't be able to directly update it, but she could still use the equivalent of {{edit protected}}.
I think that the idea of this professor wanting to maintain creative control over her book is a difficult one to reconcile with Wikibooks, and one that I don't think a compromise is going to be found on. the primary goal of wikibooks is the collaborative authoring of textbooks, not simply a compilation of existing textbooks. While there have been some efforts in the past to "donate" existing books to our server, those efforts were only undertaken because the authors agreed to license the text under a compatable license, and were also willing to relinquish complete editorial control.
One point that is worth making, however, is that contributorship on wikibooks is reasonably small. So long as your professor actively monitors her book, it is unlikely that anybody else will ever edit it (except for the occasional small spelling or grammar fix). As an example of this, the United Nations have donated a number of free books to our server (about two dozen, I believe), and besides small fixes on occasion, nobody has substantially edited any of those books in months.
By being an active editor on this book, it is likely that your professor will maintain creative control by default, although if other interested contributors do try to make changes, there really isn't anyway that she could stop it from happening.
This has pitfalls with respect to readership volume. Basically, publishing it on Wikibooks will ensure that it reaches a comparatively large audience, through Wikipedia sister links if nothing else.
This point is true, but wikibooks is not supposed to be an advertising platform or a personal webhost. Getting the "wiki benefit" of readership requires that authors release there contributions under a particular license, and that they agree to let anybody edit it mercilessly. It's the price you have to pay, unfortunately.
--Andrew Whitworth
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