Hard to say. There might be elements of truth in it, or it could be a complete work of imagination. You'd need to look into the background and the creator's intentions to know for sure.
I'm not entirely sure specifically what 'lillian121 fanfiction' is about without more context. It could be fanfiction related to a character named Lillian, perhaps from a particular book, movie, or TV show.
Since I don't know the details of this 'Lillian Hall true story', it could potentially be a story related to family heritage. Maybe Lillian Hall had a remarkable family story that has been passed down, like a story of immigration and how her family overcame difficulties in a new land. It could also be a story about her contributions to a community, such as starting a local school or helping the poor in her area.
The Great Lillian Hall is purely fictional. It was crafted by the author's imagination and doesn't draw from any true incidents or actual individuals. The story is designed to entertain and engage the readers through creative storytelling.
Since I'm not familiar with 'lillian121 fanfiction', you might want to join relevant fan communities. There, you can ask fellow fans if they know of any good 'lillian121 fanfiction'. They may be able to point you in the right direction based on their own reading experiences.
I'm not sure specifically which 'Lillian Hall' you are referring to. There could be many people named Lillian Hall. It would be helpful if you could provide more context, like what era she was from or what she was known for.
You can try some well - known fanfiction websites such as Archive of Our Own (AO3). It has a vast collection of fan - created works, and you might be able to find quite a few 'christine x lillian' stories there. Just use the search function on the site and type in 'christine x lillian' to see what comes up.