keep feeding half of the veg food that you were until you see that her flowering stretch has stopped, then cut them down to 1/4 of the max mix you used in veg.
When you start seeing pistils/hairs developing start her off weak on flower nutes and build up to a full strenght dose within 4-5 weeks, taper off a little after that and then flush for 2 weeks.
I say 2 weeks because you used a crappy plant food and that taste will be really heavy in there if you dont. It works but it dosent all the same, accommodations need to be made for it.