According to Catholics were Adam and Eve aware that they possessed immortal souls before Satan told Eve that she would not die?

Eve's comment to Satan in Eden seems to indicate that she and Adam believed that eating of the forbidden tree would result in absolute death. They likely had witnessed the death of animals and would have understood what death was like. Catholics subscribe to the belief that the physical body is all that dies and the soul continues alive. This sounds very much like what Satan told Eve: "Thou shall certainly not die" (Genesis 3:4). Do Catholics believe that Satan lied to Eve or that he revealed to her that she had an immortal soul that until then she was unaware of?