I had a problem with black flies too. I was overwatering my house plants and the infestation spread to my ladies. I used sticky traps to catch them. They were meant for windows. Just a piece of plastic about 7x3 that was super sticky. Took care of the problem within a week or two and caught about 200 by then. The sand thing is a good idea though to stop them from laying eggs.
I would definitely recommend getting a timer for any further grows. You can get one for around $10 for the most basic digital model, and you definitely want the digital.
She is suffering from a nitrogen deficiency from the looks of those leaves, but don't feed her since she is so close to harvest. Those leaves will be all yellow by that time. Just look at my harvested grow in my sig and you'll see what I am talking about.
I would say do a flush soon, and then right before you leave chop her and hang her whole. You can give her a heavy watering the night before you cut her so she is water heavy. These two things will slow down the drying and she should be good about the time you come back. I don't think she could go for another 3, but I could be wrong. If you decide to wait until you come back feed her now and flush 2 week before you would harvest and maybe even again 1 week before to make sure you get all the leftovers out of the soil.
Also, since you turn on the lights when you come back from work the day before you leave don't turn them on. Give her an extended dark period to maximize resin production. You also don't want to chop her if the lights have been on for a while. When the lights are on she will move salts and nutrients from the roots to the buds. At night they move back down to the roots. So you want to cut her as soon as she sees light. This will make the smoke smoother and so will the flush.
I was curious about how it would turn out too and I also think she looks great 
