As we all know by now, we shouldn't use cognitive biases as a counterargument against people we disagree with. Either her criticisms are true or they aren't; whether she is committing motivated cognition is irrelevant.
I agree that she brings up some very important points, and I would be very interested to see them discussed herein.
Well, yes, but in so far as she is an expert in her subfield and some amount of judgement about her as an expert is occurring, that she's engaging in motivated congnition does become relevant.
I recently found something that may be of concern to some of the readers here.
On her blog, Melody Maxim, former employee of Suspended Animation, provider of "standby services" for Cryonics Institute customers, describes several examples of gross incompetence in providing those services. Specifically, spending large amounts of money on designing and manufacturing novel perfusion equipment when cheaper, more effective devices that could be adapted to serve their purposes already existed, hiring laymen to perform difficult medical procedures who then botched them, and even finding themselves unable to get their equipment loaded onto a plane because it exceeded the weight limit.
An excerpt from one of her posts, "Why I Believe Cryonics Should Be Regulated":