I recommend "Immortal Fate in the Immortal Spirit Cave" to you. This is a Xianxia novel written by the author, Hui Feihui. The female protagonist was a modern city leftover woman who had transmigrated to the cultivation world to become a loli. She had a mysterious sect's cultivation method. She practiced pills and killed demon beasts while exploring the path to immortality. I hope you like my recommendation. Muah ~