Agree'd, to much nutrient for that small plant to handle!

It seems you water to much also, there's absolutely no reason why you should be watering everyday.. when you water, always give the plant enough water so that you see it leaking out of the bottom of the pot. this is how you know that the entire soil medium is wet.. if you only give it a little everyday to wet the top soil, the roots will develope poorly and the plant will show signs of overwatering... in my opinion you shouldn't be watering more then 2-3 times per week... if you MUST water daily because the soil is bone dry.. you're doing something wrong.

I accidently overdosed on my girls fertilizer a few weeks back, i compensated by just adding plain water...worked like a charm, it only showed signs of over fert for a few days..and the damage was minimal.

you've gone the extra step and cut the damaged leaves off.. but in my opinion you could've just trimmed off the damaged part... hope she recovers, i'm sure she will...

P.s Don't forget that these things are just PLANTS.. granted it's not as simple as just throwing some seeds down and coming back in 6 months to a nice full harvest...but it's not rocket science either...sure co2 helps, but it's not required.. niether is fertilizer... but it helps..

Don't baby your plants.. unless that's what you want.. baby plants...