.

she is really weird... really weird. a bit too decisive considering her background and that the jump was so small. she seem like someone who lived much more or even another life.

idk, i feel that people are inertial beings. changing is the most difficult. that is why the motivation crap out there sells so well, we always need a bit more.
we mirror society in a way, as we have our own traditions, the things we are used to. in a way, that is why addiction is so difficult to battle, as so is procrastination or even our slightly obsessive hobbies.
on the other hand, time changes everything, but time is the focus there. we need time to adapt and change. even tragedies follow this somehow, you are first frozen, then it takes a while before it really hits you.
sure, the world isn't binary, but i think this applies very well in general given or taken a bit. humans adapt very well, but we need experience, we adapt by trial and error.
the mc here tho, it is like a switch was turned and everything became clear. and when you live a lot and suffer a lot, sure, that happens. but she didn't even had time to mourn and died right there at the moment of the discovery.
when she goes back, everything is clear. the hurting is clear, the manipulation is clear, the lack of true love is clear, everything is clear. she feels to me like a robot more than it should. because there is no conflict inside her head, she knows everything about herself (no trouble, no weird feelings). it is the same disease super op characters has, but to her it related to her personality and personal choices only.
she doesn't know everything much about magic and such. her power didn't creep. but her own sense of self did.
and to be clear, i don't think her choices are wrong. instead, they are right, too right.
and it feels robotic due to the time bracket: too short. there is a lack or cause and consequence, or at least a lack of explanation.
i would at least expect some internal conflict from someone who showed so much blind faith towards someone else. it feels like death was a 100% cure pill that destroyed all her character flaws. a bit weird.
she isn't an exception tho, it is pretty common in the isekai-timejump-like genre. but thinking further, i feel so strong here, because it is quite fast paced and we got to see much more than others stories here with 20 or even 100 chapters. the author really puts the stories fowards, and this may have highlighted the small flaws a bit more than on the similar stories.