looking at her style in all but one or two books, she started the story in the middle, right before a turning point in the overall plot of the universe. then ended at another major turn. ready made sequels and prequels. the only book offhand I can think of that started fairly close to a beginning, was Damia. The only book I can think of that could have been tough to toss a sequel onto was All the Weyrs of pern.that one was as close to ending a book as I've seen her do.
only one book of hers I can think of where she ended a book with another book title. that was at the end of Dragonsdawn. and it wan't even a title of a book, but the name of the first trilogy.