While there are several named female characters, they do not engage with each other.
The tiny exception is the mom says to Valentine, "They won't let me see him." But with no response this hardly qualifies as "they talk to each other" and is certainly about a man (Ender).
General Remarks:
Aside from the underutilized Valentine, there are two other major female characters:
- Major Gwen Anderson (Viola Davis) who her own motives and often holds her own against Harrison Ford's character (as far as it is possible for her, since his character is a Colonel and as such ranked above her).
- Petra Arkanian (Hailee Steinfeld) who has the biggest role out of the (non-villanous) recruits and has a pretty big impact on the plot.
That said, the motivations and actions of these two women are still seen solely through the lens of Ender, which is perhaps not surprising considering that the movie is named after him and completely focused on him as pivotal character where all the actions taken by other characters solely matter in the way that they effect Ender.