This is sad.
I can understand the victim's confusion. She was in the centre for a psych assessment (which she passed).
Here is an elderlay lady removed from her home where she was caring for her sick husband. She would probably be very worried about him and feel uncomfortable out of her own home. And then she is abused. It doesn't surprise me that an id was difficult. But others in the centre who saw him come in at that time should have been able to provide some support for him being there at the time of the assault.