If it is a Sativa Dominant Strain, you may have gotten a Pheno, that has taken on more of it's Sativa qualities and hence, longer flowering.
Actually the last Haze strain that I grew, was not completely ripe for nearly 18 weeks and it was supposed to be a " nine weeks Strain. "
When this happens however and you get a Pheno with mostly Sativa characteristics and are patient and let it go all the way, " the wait is worth it and you will be in for a wild ride. "
You have came this far, do yourself a favor and let her get completely done " no matter the time " and you will smile ear to ear when she is dried and cured and smoked.
Blessings,
Rev. TheNatural