While in the load/unload area, the boats are on large belts, not floating in water. The belt malfunctioned and caused the woman to stumble. It's sad, but sometimes these things happen. All rides at WDW have new signs saying "remain seated and supervise children" on the walls and in the ride units. This happened after the man stepped out of his log at Splash Mt.
Flamingoes get their pink coloration from the shrimp that they eat. Shrimp are pink because, of course, they eat flamingoes.