Just a bit more data here:
In a few scenes in the main quest Minfilia does something rather... Interesting. While you are busy talking to the other Scions she will take a moment to talk on the phone- I mean linkshell with the Students of Baldesion. Her words aren't subtitled, but the scenes are also voiced and you can hear her talking (missed the correct words since I had friends on skype at the time).
At the last scene where she does that, somewhere after the scene in Meridianum, she mentions "Grandfather" too