She's obviously had a tremendous shock. She has a mental block. Her mind refuses to remember something.
10 seconds sound clip from the The Angry Red Planet movie soundboard.
You can hear this line at 00:32:01 in the Blu-ray version of the movie.
Quote context
[...]
- I'm convinced that all fashion designers are woman-haters.
- I don't know. I can't remember. All I know is it was horrible.
- All right, all right. You rest now, and we'll talk to you later.
- Nurse, Sodium Luminol, two and a half grains.
- Yes.
- You noticed her memory is already beginning to take on a quality of unreality.
- We must know what happened. A man's life, perhaps more, depends on it.
- I know.
- Suppose this alien infection spreads to all of us. Every moment counts.
- What about the tapes? Any result?
[...]