When you revert your girl back to flower especially after she is a whole plant you are asking for many things and most of them aren't good. When plants come out of flower and reveg they will go through a massive growing sprut with all kinds of new coming out of where the buds where in the beginning. This new growth is going to be spindley at best compared to the other growth on the plant. Unless you have lots of time to grow this girl out and reprune her to a good growing canopy you are much better starting with a new batch of seeds as mentioned before.
The short of it is yes you can reveg, but the benefits are few when you consider the time it will take to make her a good healthy plant with branches strong enough to support your new buds. Also when you bring them inside from outside make sure that you keep her away from any other plants you have. I say this because you stand a huge chance of bringing in unwanted bugs into your grow room.
Hope this answers your question, good luck with whatever you decide