If a woman did “the secret act” and there were fluids and after that the woman thought that she broke her fast because of it and ate something because she thought she didn’t have to fast anymore because she broke her fast. What does she have to do after ramadan. Does she have to fast 60 days? Or does she have to fast one day and pay kafara keeping in mind that she ate because she thought she was allowed to cause she broke her fast

Since she ate without knowing and then realized later. She will pay for only one day after the holy month of Ramadan.

She will do 60 days if it was intentional.