Brother you can see the nute burn on those tips man. The girl looks healthy as can be and is doing good with the flowering , I think for the size container and growing medium soil that the nutrient levels are a little to high just cut back on the nutes a bit lower the nitrogen because you don't need as much into flowering cycle. The container being so small just plain ph water for the next few watering then back into the nutes she will be fine they bounce back quick cheers.