She says that when she woke up, the baby was in the water.
Police said the circumstances around the accident seem suspicious.
The woman claimed to be the only adult home at the time of the incident.
She said there were, however, three other children in the front room, a pair of 2-year-old twins and a 4-year-old.
All four of the children are now in the custody of the Oklahoma Department of Human Services while police investigate.