Re: Mass effect 3 Citadel Bug - Miranda keeps dying
You said she is not a love interest, but just want to verify that she wasn't yours in ME2.
In any event there are only a couple requirements to keep her alive.
If romanced in ME2...
-You have to tell her you want to continue the relationship in the first conversation. You do not actually have to lock her in as the LI. Just meet her in the apartment after you lock in a different LI.
-If you break up with her she dies.
General requirements
-You must warn her about Kai Leng when you speak with her via the comms in the Spectre area. You do this by reviewing the email Anderson sends you on Kai Leng
-You must give her the Alliance data when she asks for it in the apartment.
That's pretty much it.