Triada Because 1 she did not want to hurt Edward and 2nd she also did not want to hurt carsile either so she said she felt nothing but in reality she felt it like she was burning at the stake
MKB-mykindabook She didn't want to hurt Edward she said she remembered the transformation just not the pain and anyway she said she was going to tell him any way she probably just didn't get around to it with all the stuff going on
Alexandria By saying that she remembered the transformation, she would have been asked if she was in pain. If she then went to be even more honest then Edward would have been so upset with himself instead of being happy that he could live with her forever.
Story Sorcery She didn't want Edward to know she had been in horrible blinding pain for two days straight. She thought he might be upset.