I don't understand why Asoka completely hid Bariss' during either hearing. Here she is on trial for her very life, in addition to her standing in the Jedi Order, and she doesn't mention anything about Bariss? This information could potentially aid her defense at the very least and explain why she was in the location of the nano-explosives.
Probably because Asokha trusted Bariss and not thinking she was the traitor didn't want to drag her into things.
After all what if Bariss has innocent and expelled from the order as well? Asokha wouldn't want that.