When it comes to reincarnation/Isekai takeover, there's so many ways stories has approached it. On one end of spectrum is more of the disturbing mind takeover. On the other end is more like the person just awaken to past memories.
While I know the story's direction (particularly in one of the chapters but not uploaded here) is more approaching the former. But one of the bigger traits of the former is the lack of memory of the past life. I do want to point out that Main does remember herself before the "takeover". Albeit it was largely her in bed and in agony, but it shows traits of the latter. And I prefer to think it's more like that than essentially an ego death (AKA Kaede)