What would the beta reading include?
First and foremost, I would be helping to make sure that your writing isn’t offensive in its portrayal of mental illness. I’d provide detailed feedback on your mentally ill character(s), the symptoms they’re experiencing, and overall help you make your characters as close a reflection to reality as I can. If you don’t know what to diagnose your characters as, I’d help you out with that as well.
If therapy or hospitalization is depicted in your story, I would also go over the accuracy of what you’ve written - or even help you figure out what a therapist would say in the first place.
In short, you would be paying for the full and complete attention of the Shrink, who has a masters’ degree and clinical and personal experience with mental illness.
I’ve spent years helping out writers on my blog, but there’s only so much I can do within the confines of an ask or two. This is a chance for you to get detailed, private feedback, specifically directed at you and your story, rather than through short questions and masterposts.
Thanks for asking! I’m glad this is something people are interested in!