ok, ill jump in.
What strain, how old, soil mix?
Check :
Drainage is good, ie, holes in the bottom, are you are getting run off waste water from the bottom every time you are watering?,
Feed? are you feeding her yet?
What size pot? as she might be out growing her pot.
how tall is she?
is her new growth ok or is it just the lower fan leaves?
have you got good air circulation blowing around the leaves?
are you exchanging enough fresh air & is she getting it?
Hope that helps ya bro for starters & im sure some one else will also jump in and help ya.