After the flush it might be a good idea to go with half-strength nutes, till she shows signs of improvement. (perhaps a week?) Force feeding a stressed plant a good way to compound the stress. The food she finds should green her up just fine, then back on schedule.

Nutes can and will lower your ph a tad (for me, .2 or .3 lower ph per gallon) depending on the brand and type, but if you are using the nutes to lower water ph, you'll kill the plants. (overdose) If you need to adjust ph, best to use something made to do so, but aquarium and pool chems should be avoided. (in case you were wondering, lol)