Mhari has got stuck in her 19 year old persona because that is who she was elected as - it's literally a role and she is stuck playing it.
Yes, that makes sense - a kind of audience capture.
I think she's gone too far into one aspect of the role, though. She was elected, I imagine, largely because her constituents wanted to see independence. And possibly partly because she was a pretty stirring orator, especially for someone so young.
But she seems to have landed on 'Mouthy Working Class Swears a Lot' persona, and neglected the essential addition of insight, nuance, and honesty. Those were also what her constituents admired in her, I would think.
Just insulting people and being sneery is not admirable.