In the preface of frankenstein what does author say she is trying to preserve?

In the preface to *Frankenstein*, Mary Shelley says she is trying to preserve the "original conception" of the story, which she explains was conceived during a "waking dream" that was inspired by a conversation with Lord Byron and Percy Shelley.

She emphasizes that she wants to ensure the original "spirit" of the story, its core ideas and themes, are not lost in the retelling. This is important because the story was originally written as a collaborative project and has been subject to various interpretations and revisions since.

She also mentions that she is trying to preserve the "impression" that the story gave her, which suggests she wants to capture the powerful and disturbing impact the story had on her own mind.