Her previous life was perfect in the eyes of outsiders. Make everyone admire and envy. But for her it is emptiness and loneliness, from family to marriage is fake.
When she killed herself, she was reincarnated to another world, in a body that was not human. Where she will not only find a new life, but also rule the world.
Mc accepts being a turning into a worm in one sentence, the level of detail is well mediocre but I would say its not bad if the author would add some detail and make the mc act more normal and not be like oops i guess all that meat I've been eating is actually burnt human flesh o deer me my bad, she was a human just a chapter ago.