Throughout the Suicide Mission, only one character had a limited amount of plot-armor, aka Miranda. ( Apart from Joker obviously )
It is highly unlikely to get her killed, unless you know exactly how to proceed, thus it implies that Devs wanted to keep her alive, even if the player somehow magically screws things up big time with a big stamp of meta-gaming. ( Again, highly unlikely. You won't get killed in CB unless you know exactly how to screw things up, or... Rush trough the game, and be extremely mentally reduced not able to figure which character goes in which position )
So, I'll guess that from all of the M2 characters, Miranda has the highest probability of playing a substantial role... Rest; Well, a nice tomb-stone cameo..?

Still, provided the Devs wanted Miranda so badly, why she did not reciece full bullet-proof armor..? To appease the non-Miranda-fans..? Possible.
Yet, if the Devs have so big plans for her, why she wasn't announced as a squad member like Garrus/Liara/VE survivor.. Many questions.