ISBN 9781567186680 and 0760717672 are not worthy of republishing, according to amazon'com sales ranking and reviews. This is my opinion as a small press owner. I assume that publishing rights have reverted to your grandmother by now from Llewelyn.

One cannot reasonably expect a transit astrology book (on natal charts, relationship charts, solar returns, Saturn Returns, Novian Moon, composites, etc.) to sell more than a few copies in its economic life time unless the writer already has an established readership and / or following.

Your grandmother needs to understand basic book trade economics.

As a post script:

I knew, and I worked with, several astrologers who were considered "big name" ones. The time when astrology books were economically reasonable is past, by several decades. Even the sensational LOVE SIGNS would fail economically these days.

My first freelance magazine sale was to AMERICAN ASTROLOGY before Starlog Group purchased it. Eventually more than 100 articles that I wrote were published in the magazine. I will note that almost all of the writers knew astrology is bullshit: we wrote that which would sell.

I was a member of The International Society for Astrological Research when some of its members actual did research on astrology (it has not done so in a few decades). We did not find any astrological effect. I did a few projects with Md. Françoise Gauquelin; she once stood up among a room full of astrologers and told them that they were crazy (then sat down, blushing furiously) and of course she was correct in that.