I think I know who Elena is

I believe that Elena is actually Nadia's headmistress at the orphange. I went to spoilerfix.com and both Elena and Nadia's headmistress Sophia are both played by the same person.
That is great, but you should have posted this in the spoiler forum! No hard feelings since you are a newbie...but in the future stuff you want to talk about that you find at spoilerfix or anywhere else like it needs to be posted in the spoiler forum. Lots of us here at AA are trying to stay spoiler free! Thanks! ;)