Board Thread:Speculation House/@comment-4830106-20140905003518/@comment-96.254.157.84-20140905200329

I'm unconvinced that Yang's mother would come off as evil - there are too many Darth Vaders already. My assumtion is that she is helping Qrow, Ozpin, and Ironwood with taking down the bad guys and because it was so dangerous, she had to leave Yang and her father. Of course, that is assuming Summer or Yang's father didn't know, given that they are on the same team.

That, or she didn't think she could handle being a parent. Either one works.