Whilst plotting how to manage that in the SM it occurred to me that maybe it's best for her to get killed by rocks after deciding to destroy the collector base on this and perhaps all my future playthroughs.
I quite like Miranda in ME2 but her part in ME3 is just awful. She keeps banging on about her sister in all 3 acts without any sense of perspective (does she not realize it is literally "End Of Days"?!)
And the big confrontation towards the end feels really lacking if she lives (and makes the subsequent Tali-drunk scene really weird). But if you let her die in 3 then that's another "score" for Kai Leng, which also feels unacceptable!
So I'm thinking that her finally turning against TIM at the end of 2 and then dying redeemed is the best solution all round.
P.S I believe in Virmiring Ashley for similar reasons. Are really great character in 1 gets utterly butchered in 3.