Well, according to CNN and the Globe and Mail
She's standing on a pile of dirt and brush. The bulldozer started to push it, and she fell while trying to get off the pile. The bulldozer partially buried her, then ran her over, and then backed up and ran her over a second time.
Also, one member of her protest team quoted her as saying "my back is broken" when they ran up to her after the bulldozer was finished. That last detail was on the CNN site.
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