yeah it makes no sense
All jail calls are recorded and both her and her Dad would know that anything they say will be monitored by staff from prosecutor's office, but in any case her asking about how her son was doing in jail couldn't be used against her - it actually would be to her benefit. ( Plus EC & JC not co-defendants)
Anyway, her evidence on flagging seems inconsistent because she did mention him in a jail call. She made a reference to EC 'needing to man-up'
She was inconsistent and contradictory throughout her testimony and many things weren't picked up on the ineffective cross later