That's an interesting detail! Perhaps she was lying down & the Cruise smarts didn't perceive her as a pedestrian, but more like an obstacle / 'bump' in the road?

Just speculating here, but would be useful to find out.

If human drivers see a pedestrian get hit or someone falling down, we instinctively know that's a human there on the pavement (and try to avoid at all costs, just like for pedestrians walking around). Or avoid human-shaped / human-sized objects just in case.

If a self-driving car would lose track of a human as soon as it stops looking like a typical pedestrian, that would be a problem.