haha dam man that sucks but yea she should definetly grow back , probably like 3-4 days. i have a habit of doing things like that, i snaped the top off of my purple kush by accident and now its the biggest/tallest plant, with the most tops, and i bet when u put that other 600 in, the plants r gonna love it, i have 2 600's turned on over mine, soon ill turn the 3rd on, but with the 2 on so far the plants r just growin unbeliveably fast. let me know how the neem oil goes, i bought some but havnt used it yet, i used a pyrethruim bomb and it worked great it killed everything in my rooms except the plants