Sometimes it is a bit hard to target the right oracle - keep moving your cursor around and look for gaps if the sisters have formed a triangle around the one you really do need to talk to. The sisters do not say "You are the choosen one" as I recall. If my memory isn't too rusty they only say things that indicate you are not talking to the correct sister. It's been a while so I might be mistaken. To get the western passage to open you have to use the correct keyword "Destiny".
Do you have a save from shortly before this point in the game that you can reload and try?
Hope you will manage to get through soon. If not, let us know, we'll find a solution!
Wyv
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