She gets better access to Ministers for interviews etc, the odd scoop etc.
You don’t go far in political reporting with out good access to government. You don’t get (and keep) good access to government people without winning their favour.
In return for carrying the party message, she gets thrown the odd no-mark (or disobedient MP) To bully on tv once in a while, to enhance her credibility.
She’s by no means alone. It’s just the rules of the game.