I obviously don't remember it because it was months ago, but I was under the impression she could return at some point.
Would be interesting to know what gave you the impression.
If Belle(creator) said so/alluded to it thats obviously on me because I missed it but as far as the story is concerned I dont get that impression at all.
Evelyn´s incestual aversion and the responsible emotional trigger are rather deeply woven into her character(to the point she semi-prostitutes herself)pointing towards a incredibly strong conviction on her part(probably the strongest we have seen in a character yet,going by her reaction to the mindbending attempts).
Add the meta-narrative reasons of the game´s tight timeframe,the finality of her last scene,the focus on replayability as well as the already mentioned death-flags and I dont really see how her returning would either fit nor serve the narrative.
Maybe(and thats a big maybe)in the finale as a conspirator of her order and to see to the safety of the MC but most certainly not in the relationship fashion people seem to expect.
Kinda hard to argue without knowing the reasons for your impressions tho. <_<