User blog comment:Zathronas/Analysis by an author: Trailer "RED"/@comment-10380701-20131221001613/@comment-24218038-20131221014740

It's in the past, since this has the song "red like Roses part 1" and "red like roses part 2" Is about someone's death in Ruby's past. It may be contested but I feel it is kind of obvious. As I said a little lower, there is such a thing as over-analyzing a situation.

My take is simple Summer is Ruby's mother and she dies when Ruby was young.