When Elena injected Nadia with the nasty ass water, it was injected into her rambaldi symbol and that's what made Nadia try and stop Sydney and kill her.
Now when Anna burnt Nadia with <o> symbol she said "one day whether you choose to or not (hence Nadia going crazy and not knowing she was hurting and she didn't want to so Elena injected her) who will help me destroy Sydney.
I just thought it was interesting how it tied together and I don't know if it is a coincidence or what but it seems Anna and Elena may have collaberated...
Now when Anna burnt Nadia with <o> symbol she said "one day whether you choose to or not (hence Nadia going crazy and not knowing she was hurting and she didn't want to so Elena injected her) who will help me destroy Sydney.
I just thought it was interesting how it tied together and I don't know if it is a coincidence or what but it seems Anna and Elena may have collaberated...