User blog comment:Zathronas/Speculative author: Who is Summer Rose?/@comment-9464517-20140809092857/@comment-96.254.157.84-20140809151649

That's assuming that Ruby knows if the Schnee company is responsible at all. If we go based on the song, it can be assumed that someone told Ruby that her mother was dead rather than seeing it herself. And that could mean they withheld information about who killed her because they felt she was too young to understand.

In concern with the White Fang, perhaps Summer tried to gain the trust of the previous leader, but because of Schnee's interferance, the White Fang lost all trust in humans and the old leader stepped down so that another could begin their violent reign.

So far, it has always been Weiss who antagonizes Ruby in the first season. It'd be interesting to see the role reversed: Ruby learns that Weiss's family was responsible for her mother's death and now questions if she can trust her partner.

Just speculating.