...she seems to move from the spot where she first sees Veronique to her place sitting outside a restaurant watching Veronique walk past too fast
When Véronique first sees her, she is inside the station. The red haired lady is waiting to order at the cafe.
Véronique then goes outside. She then re-enters what seems to be the main station hall and the red haired lady has presumably ordered, and then sat down in what is most likely the same cafe.
I wouldn't say it was TOO fast.
Although we can't be sure, I'd imagine its probable that the red haired lady had also tried out for the part that Weronika won the audition for.
Its probably worth remembering too that when she sees Véronique for the first time, it is most likely a significant amount of time after,perhaps even a few years.
Véronique had gone to Poland on a school trip, as a student, and later throughout the film is working as a teacher.
Upon seeing Véronique, the red-haired lady (on holiday in Paris maybe?) may have been shocked because she undoubtedly knew what had happened to Weronika, and couldn't believe she was seeing what seemed to be her alive in Paris.
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