Iv'e found vast differences between some strains. If she's stretching and acting like she's in flower. Then you have no need to worry, you are a-ok. Ive seen pistils at around 12 days on some strains and some strains like the tangie I currently have didn't show strong signs of flower til closer to about 3 weeks. I've heard of 14 weeks or longer for some strains so I imagine this guys can "show" even later. Although not particular familiar with your strain, as mentioned before if you see the stretching, she's definitely in flower :). I hope this helps and happy growing.