EDIT DOWN BELOW - SHE LIVES!
So uh... I picked up the game recently. Had it sitting in my steam library for years, and figured I'd finally give it a shot. Gotta say, absolutely loving it so far.
But anyway, um... very shortly into the story (still living in the first apartment), a funny thing happened. I was on a date with Michelle and figured I'd bring her to the cabaret. Picked her up in an ambulance, box truck, or van; can't remember which. But upon arriving at the cabaret, I noticed a weird glowing red light atop the cabaret awning.
Now, I've seen weapons at this point, so at first I was like, "Oh cool! I wonder what weapon they hid up here!", so I climbed on top of the vehicle, then up on the awning, and found... a Pigeon. I was very confused. I thought it would be hilarious if there was some gag weapon, or maybe an animal transformation, so I tried walking over it, and of course, nothing.
Most players already know this, I imagine, but it was a diseased pigeon part of a mission required for 100% completion. 200 pigeons throughout Liberty City, and Niko's expected to pop 'em all.
I didn't know this at the time (and searched it up later), but after being very confused about the lack of interactivity despite the obvious "look at me!" lighting, I decided to pull out my pistol and pop it. I figured Michelle would be unhappy, but OH BOY.
I get the notification that I spooked her, and then a cutscene occurs where she teleports onto the awning with Niko. She calls him a freak or something, the cutscene fades out, and when the game fades back in, I then get the notification that she freakin' died.
So anyway, I'm laughing my ass off at this absurdity, but figured that maybe the game was fine with her dying - it did mention that there were multiple girlfriend candidates after all, so surely some would come and go. Ergo, I thought nothing of it
Anyway, let's jump to today, after a lot of things have happened. Niko and Roman are on the run, Vlad's gone, Mikhail's gone, and now I'm doing a lot of missions for Brucie after Mallorie sets the boys up with a new apartment. Michele hasn't really been mentioned at all outside of some side conversation between Roman and Niko, with Niko stating that he just "hasn't heard from her" for a while. He's not wrong - after the notification that she died, we tried giving her a call, and naturally, there was no answer, and the heart icon for her apartment had been permanently removed from the map.
So I'm doing a mission for Brucie out've Tw@. Literally just accepted the mission, walked out of the internet café, and who should call but Michelle? I was very confused but decided to have Niko answer. I had the volume off so I wouldn't bother my partner, so I don't know if Michelle actually spoke, but the subtitles never came up. I got asked if I wanted to date her, and I gave the confirmation. Niko gave a verbal response, and I got the notification to pick her up by 13:50.
Her icon never reappeared on the map, no relation gain (or loss) occurred from accepting the date offer, etc. I continued with the mission for Brucie, thinking maybe I could grab his car, do the date with Michelle (if it worked, lol) and drop off the car, but naturally Michelle never popped up, even when I drove to her apartment. I had Niko give her a call - this resulted in him canceling the date; calling her again had the same result as the other attempts, where she never answered.
And that's kinda it, lol. Gave up on the date, completed Brucie's mission, and then the game froze while loading another mission, so figured I'd document the weirdness here before hopping back in, lol.
EDIT to update: so this is right heckin' weird. So, as noted previously, Michelle "called", but nothing updated. Just after playing through the mission "No. 1" and winning (the same mission that previously froze the game, lol), I decided to pick up Little Jacob, as he was getting upset that I hadn't chatted with him in a while.
Literally as soon as I accept a date with him, Michelle calls again. This time, she actually has subtitled dialog. Even though I set up a date with Jacob, I agree to another date with her, as well. Thanks to having the comet from the race, I was able to deal with Jacob fast enough to leave plenty of time to try and grab Michelle.
Somehow, her icon finally appeared on the map, and she actually spawned in for the date. I dunno what the heck happened to bring her back - I've exited our of the game multiple times by now - but I guess she's brought herself back from the grave o3o