Gold1answered grow question a year ago I'm going to agree with Newbie87. Your plant is showing signs of Nitrogen Toxicity which takes the form of dark green leaves and a slow growth rate. You may also end up seeing burnt leaf tips if you continue to feed her nutrients.
I recommend that you do what Newbie87 said and wait until the soil is dry and just water with PH'd water from now on. Since she is an autoflower, she is going to flower regardless if she is stunted so prepare for a smaller than expected harvest. She is still salvageable and you can still get really nice bud off her, but only if you don't stress her out anymore than she is already. For your next grow I would figure out a proper feeding schedule. What soil are you working with? Is it a super soil or a soil that has already been premixed with nutrients like Fox Farms Ocean Forest? If so, you don't have to feed the plant ANY nutrients until flower. Typically Ocean Forest(and other comparable hot soils) is hot enough that it can burn or stunt your plants on its own without any added liquid nutrients (depending on the strain).
Its almost always better to underfeed your plant than overfeed as nutrient deficiencies can be easy and fast to fix while toxicities/nutrient burn/lockout are harder to fix and more detrimental to your plant, ESPECIALLY for autoflowers. Think of it this way, if your plant has a nitrogen deficiency you can add some liquid N to your soil and the deficiency will be fixed in a few days. If your plant has nutrient lockout from too much liquid fertilizer then you might be screwed because it takes a long time to fix.
Good luck with the rest of your grow. 👍