Any time a plant is stressed, easing-up on the nutrients is a benefit. Unless the stress is from under fertilizing. In your case, I would also raise the lights a notch or two till you see improvement.

Best case...you'll lose a few leaves, but you should start to see some new growth and vigor in a few days. Worse case...she's way overstressed, and may not survive. Be patient. (impatience makes a gardener do foolish things to their poor plants)

If soil is dry enough, carefully slip the rootball out, and see what the roots look like. The roots should be a healthy white, but brown roots are dead roots.

It causes added stress switching from the mellow lighting of indoors to the brutality of 100,000w of sunlight. Plus, it has a tendency to exhaust all the plants and soils moisture, quicker. Much quicker.