Spend some time getting to know young studio models and you will understand her behavior.
She is just a girl trying to make some money. She isn't worried if members find it rude or unprofessional to be texting on her phone while on cam, she can't see any problem on that. She lacks responsibility.
Honestly, for the job she does, she shouldn't care about what members in free chat think. She isn't going to pay attention to random members talking in free chat when she got a friend messaging her.
It is not that she is trying to build a career. She follows what studio said she needs to do. She logs in, sit and wait for members. If a member joins the private, she gets naked and masturbate. When shift is over, she can go home. Job done.