As for hints, the problem I have with hints, in this game more so that many others, is that I can see so many potential paths forward it's hard to tell what I'm just thinking of versus what's deliberate hinting of something that's actually going to happen.
Like Lilith was in the clothes shop with MC and Sylvia, but didn't seem to interact with her. So this could be seen as Lilith having protected Sylvia's memories in anticipation of her impending death as per her mothers request. This is backed up by Eve stating that Sylvia will be more important to us than even Alexis, which when Eve made her original request of her daughter to protect the memories of someone for her, that the doomed girl would be very important to us and her death would hurt us deeply. Granted as it stands MC isn't particularly close with Sylvia, certainly nowhere near as close as Alexis, or even Kelly, Madison, and Ellie (still don't understand why she's only optional harem rather than main but whatever). This comment on Sylvia being more important than Alexis is kinda what annoyed me about Eve this update.