at 2'-3' tall in veg the plant could grow to 4'-9' during flower, depending on the strain. if you only have one cfl bulb it isnt going to penetrate into the canopy very much. any thing more than 6" away from the bulb is going to get enough light. even HID lights aren't going to do much good for a overly tall plant. your best option for a single plant is going to be scrog or lst. the more even your canopy is the more bud you can get from your space. how much space do you have to grow her? what kind of lighting do you plan to use? can you easily control humidity, air flow, and temperature in your grow area?