User blog comment:Arbington/If You Hate Vido Santiago, You'll Love This!/@comment-118213-20120325201549/@comment-118213-20120325210522

Yeah Wrex I never thought would be a companion for that very reason....

But Miranda's business is searching for her sister and hunting her father - whilst trying to stay out of sight of both the Alliance and Cerberus. Since Shepard is also hunting Cerberus, this could have coincided with both there objectives - plus as Shepard is a Spectre, she could have given Miranda a pardon which would both allow her more freedom and to travel on the Normandy, an Alliance ship (a ship which had the Shadow Broker on which would could have been helpful to Miranda).

All i'm saying is, considering what Miranda is doing throughout ME3 is was entirely possible for her to have been a companion, and it would still be possible to add her in DLC without having to make any major changes. Though I fully realise the chances of that is close to zero.