Hm. Interesting, setting FARROW_MIRROW_DARK to 0 allows me to encounter her on the airlock, and defeating her sets it to 2, but I went back to the crash landing after the fact and she's still not present, very curious, I've checked the save editor and there is a flag for Mhorgenn last met, maybe messing with that will produce results.
Edit: Ok. Forget that last paragraph, setting MHORGENN_LASTMET to 2 made her show up. It doesnt seem to appear in the flags section of the console if you haven't already met her, so I did have to use the save editor to change the flag instead of just changing the number in the console. Doing it this way does seem to rob you of the introduction scene, however missing the intro is better than missing the character entirely in my opinion, plus the submission document for her is on the forums still, so reaading that and enjoying the rest of her content in game is more than enough for me.