first of all ill discuss your plant.
is the MG soil your using a time release fert soil? Most likely it says that on the bag somewhere. if this is the case then your plants are probably suffering from being overfed. MG soil releases fert over time which in combination with the ones you were adding were too much. You should flush your soil to remove all the nutes. next time dont use maricle grow. this is why its to hated on the forum. That should let the plant start growing again soon and keep the leaves from yellowing.
also i would reccommend getting a PH tester. This will help you make sure that your plants arent being under or overfed again.
now for the vaca. this is a problem alot of people seem to be facing. There is usually always an aqua globe thread on the front page. from what ive read, aquaglobes are bogus. They dump all the water into the plants within a day or two, are easily breakable, and they take oxygen out of the soil. There are some other alternatives people have suggested such as water bottles flipped upside down with a hole in the top or a hampster water bottle.
if it was me? i would probably just find a plant sitter. you have to be very careful with this though because people have come back and their "friends" have smoked all their harvest before. make sure you get someone you can trust not to kill or smoke your plants. make sure you pay him handsomely come harvest time as well
as for the sexing of the plant, plants usually show somewhere around 3 weeks. it can be quicker or longer. id say its taking your plant a little longer because of the shock it was in. it should start showing after it starts growing again
hope this helps