at 8 weeks you are way past the point at which you can start feeding. if i were you i would brew up an aact. i'd feed her with the tea, just like you would if watering. i'd foliar feed her as well, just for good measure. while the tea will provide her with food, it is a short term fix to the problem.
if you wanna go all out...
mix up 2 cups castings, 2 cups perlite, 1/2 cup blood meal, 1/2 cup ground oyster shell into a bowl. top dress, and cover with soil. don't let the mix touch the stem of the plant. now every time you water, you're also moving nutrients to the roots.(this will do 1, 2-3 gal pot)
either way you are looking at 49 days minimum, start to finish for flowering. unless you begin feeding with synthetic nutrients soon, you'll need to come up with a plan in order for her to make it to harvest. that is, if you wanna keep it organic. synthetic nutes are easy and effective. organic can be tricky at first.
