The incident occurred during opening hours at the farm which doubles as a zoo and draws visitors who can feed the deadly reptiles from a walkway.
The woman jumped on Friday from a resting point on the walkway into the middle of pond -- which contains hundreds of adult crocodiles, Preecha Iam-nui of Samut Prakan police told AFP.
"Her sister said the victim was suffering from stress and depression," Preecha added.
The farm is an hour outside Bangkok.
The Samut Prakan farm fences are just a few feet high to allow visitors -- including children -- to feed the reptiles.