In my favourite cRPG, Planescape : Torment there was a spell which made enemy go through time and space - he appeared 10 seconds later, but actually he lived for over half of year travelling on most dangerous planes.
He had 10 % of chances that he can survive this trip (it was a certain-death spell).
...but that might be too powerful for Miranda.
That seems like a Road thing, though. Even if it's technically time and space, it's awfully like going to another dimension where you will likely die. (Well, Road needs some killing power too...)
But Miranda needs to improve. She's now doing practically nothing... And Road should get into more action, so that would fit her.
Miranda does need some more power, but she isn't one of the main-character-Exorcists (I'd guess those are the five in the Ark). I just think she won't die at the end of this arc like most of the others... =P
Road is a mystery to us even now, though. Complete mystery...