She doesn’t have to know the original novel in order to not use life skills she had in her previous life, no offense but the male lead used his cooking skills from his last life. We can assume she died in her early adulthood or around her teens, no offense again but that’s only around 40-60 years in total MAX. You’re seriously telling me that she isn’t able to use skills or even knowledge from a world that’s wayyy wayy wayy more developed then her original one
Well the male lead transmigrated RIGHT after he completed his quest in his previous world, so ML would still remember everything fresh from his old world like it was still yesterday. His cooking, riding, and sports skill all ingrained with the help of The System, which we dont know if it existed in FL's old world.
And like I said, FL reincarnated as a BABY, her knowledge from her old world mustve been fading as she grew up, especially if we assume she had assimilated in this world completely or whatever trauma of being isolated and ignored in her previous house Shannon would also contribute to making her forget more about her past life. I said this because like many isekai stories and it's also a pet peeve of mine, the author would conveniently slap the "FL has the memory of her old world"ķ only for it to NEVER be brought up again, and would just switch to "oh she's actually the real one after all".
At least this one it still makes sense somewhat, showing how she had done nothing completely foreign in this world that was normal in her own world because that way the author would have to keep in mind that FL has her secrets from her past throughout the story, and not just, suddenly being brought up by the author for convenience only for it to be brushed off right after like it's nothing.

Why does she feel so one dimensional and like one layer, I dont get it, she's also a reincarnation, yet she doesn't use any memories from her past life in any way. I cant also help to notice how she much of a item she is the Mc. Like it feels like shes only there to better the Mc..idk the romance is good though