The FL is busy and capable to solve the ML issue at a young age but blind to notice her childhood friend issue because of her belief that since she is the original FL and loved by everyone, it is ok until she learnt that the original FL is being treated like a doll and the confession letters are just creepy and threat that doesn't treat her like an own person.
Her ability of being an inventor is forgotten mid way and the need to make money from her side income. It will pop up when the skill is convenient for the plot. It will be amusing if she chooses someone random with flashbacks hint of him in the background instead of the MLs.