The premise of this being a tragic novel is somewhat discarded right off the bat (hence the 'ruined') which is interesting because it dodges one of the hit-or-miss things we usually see where the MC keeps pulling random plot points out of their ass to resolve. None of the "oh right this is the part where this character does something INCREDIBELY IMPORTANT I had forgotten". Rather, it serves to set up the world and characters and see where they go from there.
The result of this premise feels a bit like a fever dream (ironic considering MC does heavily lean on the 'constantly sickly girl' trope) as a very childish and immature MC is basically winging it the entire time trying to build a future with what little knowledge (and short attention span) she does have, which frankly puts her on footing closer to a non-reincarnation story.
All things considered I'm enjoying it and only want for more chapters to find out more. I can't say if I'll have complaints later but I don't know enough to be dissatisfied with anything major yet.