she's very capable of dealing with controversial topics fairly.
I don't think she disguises her partiality on some issues very well. I'd be amazed if she didn't vote Remain for example. In my opinion, she can get a bit obviously grumpy with callers she disagrees with. She does asks the critical questions of the side she agrees with but her tone gives her away imo.
I'm prepared to be disappointed on the GC front on WH but I'll be very happy to be proved wrong.