She should have flown if they were making a legal request.
I have a suspicion that it wasn't a legal request in that depending on what the rules are in Portugal it might not be legal for other cabin crew staff to cover for striking Portuguese staff.
They also beat her over the head with her contract and it is not clear to me what her relationship to Ryanair actually is. Is she a Ryanair employee or a contractor employed through a third party. If a third party then why is Ryanair HR calling and not HR in the contracting company. If Ryanair wants to use third party contracting companies then they need to keep their distance from staff who do not work for Ryanair and use the right channel.
The recording is just of interest to us curious busybodies on a forum but the Portuguese Flight Attendants will probably find it quite useful if Ryanair were doing something illegal and coercing staff to break laws of which the staff would be unaware.