Her rage meant that she didn't overhear their communications with each other. It also meant she didn't notice what Superboy was doing. She was too focused on the subject of her ire.

"You will suffer for your words, you insignificant speck!"

She flew towards Alexander at breakneck speed, sweeping her staff in another dangerous arc. This one shot the power cosmic at him, but also swept up large chunks of stone in his direction.

She was leaving herself wide open. Not only would Superboy have time to work the mining equipment out of the ground, she also just wasn't watching Gohan and Tadashi. She was too blinded by her rage, enough to not even consider that their attacks could drive her into a possible trap.