You'd have to understand that the reason why we know that the husband prolly loves her is because we are seeing things in a different perspective from the MC. We see it from third point of view and the mc just read a novel where the wife had an unexplainable death. Other than that, the mc before transmigration was deathly sick and was probably very depressed, similar to the body she is in now. The body dysmorphia and the feeling of hating herself was passed on to her from the original owner of the body .
I like how realistic this is tbh and how she didn't immediately like the ml and is so cautious of everything.
This FL is so delusional . What I understand from og novel is that her husband didn't killed her and he always loved his wife, he went crazy after the death of his wife, when he died at end he said he wanted to be with his love, his love is his wife he never loved the white haired woman. FL is so naive and dumb and reach to conclusion very easily. And also that blonde haired maid cared about her a lot but she see them as enemies. And isn't she the author why don't she know any of the details and act so clueless