I've gotten to the very end of this mission where I'm supposed to kill the Undine, but the Admiral never changes. She's standing in the first room of Vendor station doing nothing. I can't speak to her, much less kill her. It's very frustrating to get to the end of this very long mission only to have it bug out at the end.
When this happened to me, I had to abort the mission and re-enter. It seems if the Admiral takes too much damage somewhere along the way, she'll just stop and stand there forever. After aborting and re-entering, I was able to get her to move with the group just fine.
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