Does light get through the white res? If so you should duct tape it our paint it so the roots aren't sitting in light.

What nutes are you using? Are you using supplements with your nutes? What size light do you have? She looks a little small for flowering. Unless it has at least four to five sets of leaves.

If you want your plant to grow faster, give it more light and the right amount of nutes, ph check your water and show it love!