I "Kinda" had the same prob, but I fixed it, It IS Nitrogen Def, is your flower nutes have less then a 1-3-2 ratio? at least 1 N if the rest are still whole numbers. The 3-2 are subject to change and if you can get away with 2N go nuts but don't over do it lol.
And giving her some vegs nutes is good it has high N but make sure you mix it low b/c she wont need ALOT of N right now, and It's easy to overdue it, and as to your yellowing not being "fixed" by this.
It's not going to, the damage has been done, They may get a little greener but at this point clorophyll production has been decimated so they will never revert back to there "Healthy" looking self.
What you need to look at is the NEW growth, the little bud leaves on tops watch them like a hawk, for good green color, if there tips start to yellow or burn pull back on the N and possibly Heat if your lights need to be raised.
*Now don't get me wrong, although I say watch new top growth like a hawk, don't forget about the rest of the leaves, although they won't really get vibrant again make sure you don't allow them to worsen...hard to do and under the HPS the light fools you into thinking there less green then you remember.
Pull her out of the hps and look under a CFL or outside light for a sec to inspect her. NOTE don't leave her outside in direct light for too long, since you've grown outdoors that POWER of the sun would sunburn your babes.
Hope some of this helps!
