K.T.
She is supposed to do this. Blowing gently on her face may works well to stop her in her tracks and distract her. Then explain in a soft voice "I can't understand you when you scream, honey". If the tantrum continues, don't give any attention to her until she calms down. This will reinforce that negative behavior does not gain attention. Praise her profusely when she requests things calmly to reinforce that positive requests merits positive attention. Good luck, you're just starting down the long road of toddlerhood where it's a rollercoaster ride as they gain control of themselves.