Janny Wurts's website has a chat area where the author posts things like updates about publication of her books.

To get to the chat section,
find the menu at the top,
hover the cursor over BOOKS,
and click on CHAT AREA.

Her latest comment to her readers in her country,
the United States (she lives in Florida, survived the hurricanes):

"Publisher HarperCollins in NY doesn't publish the book --
HarperCollins Voyager in UK does, and
HarperCollins 360 distributes the book in USA / Canada.

"[Said distributor,] HarperCollins 360 feeds the import book titles
into the same channel that distributes HarperCollins Voyager NYC/USA,
but:
a separate office handles the books published in, not imported to, the US --
the NY editorial office that handles the USA published books
has nothing to do with / could not care less
about mine [my books].

"I have to COUNT MY BLESSINGS that we have a publisher, period --
there have been SO MANY tripping points where it could have gone down."

She's correct: this series of volumes, now numbering 10 with the latest release, has been published over a period of twenty-plus years.
And no, the publisher with which she began then, is not the same as the publisher she has now. I believe two of her earlier publishers have died the death, while she goes on fighting to keep her series of books alive.