Get a group of 1x headbanger, 1x razorgirl, 1x healer cycle. Take one of the blocked fan towers. Leave them there to fend it off. Meanwhile, build another such group and send it to the other tower.
Gradually build up the stage to get roadies. Meanwhile, fly back and forth between the 2 towers closest to her looking for enemies coming. Stop and help out whereever possible with battlecry, facemelter, and other riffs -- if you don't have the riffs, go find them all -- the anvil and the zeppelin ones are wicked useful.
Send the roadies to target her stage. Use double teams with the headbangers and razorchicks as necessary. When you think you're doing well, you can double team with the roadies to get to her stage -- if you keep funneling the roadies to the stage, they'll eventually take it down.