In all fairness, I didn't see her at first, either. Someone posted a set of screencaps and I thought, "What trailer were you watching? I didn't see that."
She's in there twice. The first clip is quick flash about 2/3 of the way through. Ten leaps the barricade, we see a Dalek close-up, then there's a mechanical contraption with what looks like a rough-n-tumble version of Donna standing in front. Lights on either side flare. She's wearing a battered brown coat, purple turtleneck, jeans. Definitely the red hair is a bit of a giveaway. But I didn't believe it was her until the close-up -- which happens in the quick flashes of different images shortly thereafter. The flames in the TARDIS, Ten looking panicked, then Donna again - same red hair, differently styled, same clothing as the first clip. Then Ten reaching out for something/someone and the cut to Rose's "It's only just beginning."
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She's in there twice. The first clip is quick flash about 2/3 of the way through. Ten leaps the barricade, we see a Dalek close-up, then there's a mechanical contraption with what looks like a rough-n-tumble version of Donna standing in front. Lights on either side flare. She's wearing a battered brown coat, purple turtleneck, jeans. Definitely the red hair is a bit of a giveaway. But I didn't believe it was her until the close-up -- which happens in the quick flashes of different images shortly thereafter. The flames in the TARDIS, Ten looking panicked, then Donna again - same red hair, differently styled, same clothing as the first clip. Then Ten reaching out for something/someone and the cut to Rose's "It's only just beginning."