Ok, so I'd say it's definitely a strong Sativa if not full Sativa, which can take 12 weeks or more to flower, some can take much longer! You're nowhere close to harvest I'd say, barely started making trichs. What are your watering practices, are you giving her a dry period? The leaves look swollen and she's drooping, which usually means too frequent watering. I would resume feeding, that's likely why you're loosing so many leaves, overwatering can kill off leaves too. You say you have 12 hours of light, but how much full sun is she getting? The browning the tiny leaves is concerning and I'm not sure what to think of that to be honest. Has she always been outdoors? You say it's cold at night, how cold? Like @mysticepipedon said, some sativas will never plump up and fill out, but you need trichomes to catch a buzz... so definitely don't harvest, try to get her back on track. What were you feeding before you stopped?