What your seeing is nutrient burn. If you must use a Monsanto product, you need to start in a starting/ seedling mix. The nute content is much more mild. I have a hard time chucking any plant that's above ground, so I'd probably try and nurse her thru. Plain water ph'd, no feeding. She might stunt, or she may grow thru it. I personally don't pull any leaf that isn't diseased, any photosynthesis at all is beneficial in getting her bigger. If she'll grow, she'll get to a size to were the nutes can be used.