Ya flush her asap! anytime I transplant I always wait about a week before I give nutes again, sometimes even longer (especially in fox farm ocean forest) probably more like 2-2.5 week. When you transplant you gotta remember you are giving the plants not only more room but more nutrients within the soil as well for there roots to uptake, so I find there is no need to add bottled nutes when the plant is living happily on the new soil given. I would just cut back on the grow big for a few weeks, and just give her the plain old water. How did her roots look when you gave her the transplant? White and hairy or getting yellowed brown at all? Personally I wouldnt flush with the recommended 5x your soil gallons. anytime I have needed to flush from over fert I find if I flush with the same amount of water as gallons of soil or even a tad under im fine. Also with the flush pour half a gallon to a gallon (depending on gallon size anything under 7 do a half gallon anything above 7G do a full gallon) of water in there first and come back to finish the flush 15-20 minutes after, this will give time for the intial water to seep into the cracks and dissolve up salts so that it can be pushed out easier when you go throwing the rest of the water in, water slowly and evenly in the flush. When I used to rock ocean forest I could plant a clone in a 2 gallon pot and transplant to my 7 gallon pot after a week and a half and never have to water with vegging nutes. I wouuld veg in the 7 for another 6 weeks and then throw her in flower thats when I would need to begin giving nutes, and I assume It will be about the same for you. You would be surprised how big of a plant you can get from just the soil nutes in that ocean forest, without even needing to throw in bottled nutes..and who doesnt want to keep it simpler and do less work throughout the week? Some of the best advice I can give ya that will always help ya out in the long run, always use less than told to use when dealing with bottle nutes (half strength all the way down to a 16th when first starting the application) and if your unsure and you think it needs nutes but you cant tell, its better to wait and see a bit if a def in the nute you thought it needed arises and shows itself, than it is to throw on what you think it needs because youre scared it will damage the quality or yield. The yield, quality, plant size is damaged far more by a nutrient toxicity in my experience (10 years) than it ever will be by a nute deficient plant, a toxicity makes it deficient in not only one but often times every nutrient, a true deficiency will usually only end up being 1-3 things with it showing them one by one and not all at once. Also it is always easier to do slow and gradual increases (whether it be of a certain nutrients, temperature, humidity, soil etc) than it is to just make alot of major changes at once, give yourself time to get experience in many many things and brands and get really good at them all, so in the end you do truly know whats working better and what adding 2 ml or 5 ml of this nutrient at this week will do for you. Last but not least, when I say bottle nutes I am talking anything with a n-p-k number or micro nutrient such as zinc magnesium copper etc, thats not to say you cant add things like humic or fulvic acids which only aid in breaking down the nutrients within the soil not giving the plant nutes itself within the first few weeks if you wish to add a little umph to the size..