She doesnt show up for me at all after it goes Undine XD
Same thing here. This mission is extremely bugged. In my game, I got the communication popup where Zelle said HA HA I'M A UNDINE, but she's totally gone off the station - I spent over a half hour looking, and she's just not there, period.
I submitted a ticket which got the canned "I have turned this into a bug report" response, which isn't too helpful since I would like to be able to, you know, complete the mission, even though I understand MMOs are an evolving experience, etc.
The mission is really messed up i played it once and she left the star base the next time i played she just stood at one part of the mission and didn't even move the next time she came running from somewhere and then just followed me around the star base not doing anything and not even changing into a Undine. I have Sumited a Ticket to the Bug report
I was having the Admiral disapear as I entered the last room to fight off the Romulans.
I was having the same problem, so I left and reset it. Now she follows me around, but I can't target her.
Federation LC 9 "Divide et Impera," "Vaporware" segment, step 5 "Defeat Admiral Zelle, the Undine."
Edit: I beamed out and re-ran it 3 times. On the 2nd try I found the Admiral in the room with the first console waiting for me, but not attackable. I lead her to the final room and she still wasn't attackable. So I beamed out and re-entered the system again. This time I was back in the room with the first console, but the Admiral was gone. I ran to the final room and she was wating for me, but not attackable. I then got a prompt to talk to her and that triggered the final fight (finally!).