With the caveat that I had to google the plot of The Trojan Women because I did not know, so I might be missing something— no? I mean, they're both adaptions of the same story, obviously, but it doesn't appear to be a retelling of Euripides specifically.

One aspect of Barker's novel that I preferred over A Thousand Ships - which has a similar narrative focus on the women of Troy after their capture by the Greeks - is that Barker widened her gaze from the fallen royals (Hecuba, Cassandra, Andromache) to explore the stories of women for whom the situation just exchanged one life of slavery for another (original characters, obviously).