In my opinion, yes, we can
just ignore that in favor of a good story with Guinan in Enterprise novels, because continuity is a fairly moot point when you consider how many Star Trek novels contradict other novels already, even other episodes.
The Star Trek timeline isn't perfect, or error-free. It's very much like Batman continuity (or that of any other major franchise) - if you're not happy with all the contradictions, then only buy the books that you want to make up your own continuity.
, like me, buy all the books, read all the books, and just accept that they can't all be right.
If two books written many years apart can contradict each other and still be published, then it won't make much difference for two books written just a few years apart to contradict each other. Sure, it's not perfect, but it ain't gonna be.
At the end of the day, they're not canon anyway, so it doesn't really matter.