She noticed the jump when Castiel appeared, oddly enough she'd gotten used to it, she wasn't sure how that was possible but she'd actually accepted an Angel, her guardian Angel obviously as part of her life. Which for Margareta was a big thing, even if she didn't have long to make amends.
But if she hadn't prayed to come here, she'd prayed to go somewhere.
"Being here, with all of you, its my salvation, maybe...its possible I'm supposed to warn you, make sure your trust in her, in...me, isn't misplaced. And then I'm to die. Its clear"