Yup, it is... I'm not seeing the dark spots you've mentioned but the tips are saying she's getting a bit too much food.  If there are dark spots coming up, she could probably use a dose of calmag before that deficiency comes full force.  Otherwise, she's looking very good!  I can't wait to try the fast versions from FastBuds... If your grow is any indication, they're going to be wonderful!
Good luck!