Rate this plant please, how is she doing in your opinion? What could I improve ?

Looks like the plant is doing well expect you may have experienced a slight dry back in your medium that is causing the tips to slightly burn. What happens is there is a balance of salt and water in your plant. When the plant runs out of water or is low in water, the furthest point away from the source of water are effected because they now have too little water compared to salt. Thus creating a burn on the tip because it’s the furthest part away. Often times this is also the start of a more serious event of over feeding in which there is now too much salt in the plant that the slightest bit of dryness will cause burning to happen. Also, some growers ride this razor edge of burnt tips knowing they are feeding the absolute most the plant can handle without having more serious issues. As long as you are seeing just burnt tips, this is fine. But if it progresses further then your doing more harm then good. My suggesting is possibly cut back by about 10% on the nutrients next round and feed enough to have roughly 20-30% run off out the bottom. This will rinse out any extra salts in the medium while still feeding the plant pretty well. I hope this helps.