She then desperately tried to go after her kids, and was ultimately found by rescuers about a mile downstream.
Rushing water swept away a car, drowning a woman in Missouri; and a death was reported in Sunday morning storms that raked Mississippi.
Flooding closed part of Interstate 44 near Hazelgreen, Missouri, and officials expected it would be at least a day before the highway reopened.
Interstate 70 in western Kansas was closed because crews were waiting for snow falling at 3 to 4 inches (8 to 10 cm) an hour being blown by 35 mph (56 km/hr) winds to subside.
Also, a 65-year-old woman in De Witt in the eastern part of the state was struck and killed in her home by a falling tree, officials said.
In Texas, search teams were going door to door Sunday after the tornadoes the day before flattened homes, uprooted trees and flipped several pickup trucks at a Dodge dealership in Canton.
The trio managed to escape their car before it was swept off the road and over a low-water bridge.