Well, yes you can do this, the only reason to do it though, is if you neglected to clone it previously. I am doing this now, and there is no time advantage, if that's what your thinking. Actually, I think it will take longer. It looks like it'll take a month just to get it to normal again. Than another week or two of additional vegging.
The process basically is to harvest, leave some of the lower sucker buds on her, and as many leaves as possible. Change your nutes, and throw the lights into 24 hours on for one week, than go to 18/6.
Mine look like shit, there nice n green, they just look like shit. lol
Peace