It is being reported that the fall came from her trying to climb over the fence at the Marriott.
A spokesperson later told The Raw Story that there was a structure near the pool at the Marriott Marquis San Diego Marina, where the girl was found wearing a Roger Rabbit costume around 1 a.m. Sunday morning, suggesting such a fall. She was subsequently hospitalized for injuries reportedly including cerebral hemorrhaging, as well as skull and eye-socket fractures. KGTV-TV reported that, according to her family, her condition has improved and she is “doing much better.”
The structure was not identified, but KNSD-TV reported, citing unnamed sources, that police believe she fell while attempting to climb a fence.
Source for update: Rawstory