Hate to be the bummer...but... in a couple of weeks your plant will start to elongate. The bottom branches will go into vege mode.

How many hours of light a day does she get? If it's more than 12 and the days are getting longer you have a problem.

At that point you have two options. Put the plant in a dark place @ 5pm and force bud her with 12 hours of sunlight...or... let her go. You will get a decent top to smoke and the bottom will go long, giving you a good sized harvest come October.

Good luck.