Yeah, she is being rather bone-headed about this, but she's got a lot weighing on her mind. Seriously, she doesn't seem to pay much attention to anything beyond magic stuff, notice she was totally absent from the mercenary conversation. If only her student would share what she knows with teacher. =)
Oh yeah, or Skull Knight could have said "Apostles led by Griffith" instead of calling him the Hawk/Falcon, but, I guess it'll all coming rushing to her soon enough.