The photo's make me strongly agree..... that plant is around 3-4 weeks out from harvest, minimum. Do the leaves like to stand up really straight and perky when she's fed and happy? If so, my guess on strain would be a ChemDog, or a Diesel of sorts. What is the smell like?. Hard as heck to tell for sure though, atleast until I can smell it or smoke it. You must be using some very low wattage if she has been on 12/12 for 7 weeks. Don't even think about harvesting until you have some dyeing hairs on those buds. The gaps between the bud sites on the main stalk will fill in and make a fat cola. Your girl is still forming the individual bud sites. Give her time, be patient. Your grow looks nice and healthy, so if you want some big ass buds, wait it out amigo.