Hi mate, I'm sorry to say yes she's underperforming at all.. It can depends from multiple factors as lights, nutriens, enverinement and even genetics (some plants are genetically poor). In your case my guess would be lights and env, but it can be every of the causes indicated before. My advice here is just throw all away and restart again, also because, even if you go to complete the growing cycle, your final result will be poor and you will get low quality weed. For you next grow choose a certified good quality seed, check the environment set up and the lights and have a good luck ! 💪💪💪