It is on the first page saying who is eligible, the vast majority of the world population are not.
Anyway this is her application not yours, it seems the Czech Republic was added in 2008. I do not remember a time before the VWP, I always entered on it before moving.
She would have been asked how long she was staying, I always was, and would have had a return ticket, one of the requirements. In all my years I have never seen someone suggest they did not know about the 90 days, well some refer to 3 months.
Anyway what is done is done.