Capt Casey's parachute may well not have opened and the witness is probably quite correct, but it will be for the inquiry to determine whether this was because there was an issue with the parachute/seat combination or whether her ejection was outside seat limits. As Chug and others will know, changing the parachute part of an escape system is not a simple or quick task.
Sadly, I have been to 3 funerals of friends whose ejections were outside the seat performance envelope, which was why their chutes did not fully deploy. Whatever, it still sucks.