All right, let me head this by saying I sided with the Minutemen and saw no reason to destroy the RR, as they're not as much of a threat to the MM as the Institute or the BoS.
That said, I did some radiant stuff for the Railroad post-ending and post-BoS destruction, and they keep talking about Glory as if she's dead.
But I see her walking around HQ. However, I can't interact with her (or, well, I can but she doesn't speak). Does she die in the RR questline? I'm assuming so, and my game just can't seem to register that I didn't do their ending, or the quest dialogue is just locked in to be that way.