one thing about a sativa hybrid and especially pure sativas , they will stack trichomes on trichomes , producing up to 3 generations of trichomes
an example would be , you could take a pure sativa at 12 weeks and it would seem plenty ready , you would not be dissapointed , or you could let it go 20 weeks and be even more impressed
white widow has a lot of sativa blood , so ,,,,, you could take her now , or you could wait , i see some bulking possible , but mostly just noticeable density/weight not actual very noticeable bud size
taken now or in the near future id guess around 3 ounces , give her another 3 weeks if you can and id guess 4+
nice plant
p.s. get your electrical outlets off the ground and unless you have a back flow stopper get your air pump above the bucket