Ppl in that state needs boatloads of patience and understanding. Their skepticism and paranoia levels are over the top. It’s possible though, but one false step and they regress. We’re not therapists yet it’s possible. How much you’re willing to work with her (20% of ppl = 80% of issues) or not, is up to your patience / tolerance levels. Everybody has a cutoff point, so there’s no shame in stopping when you hit yours or even long before, just to save your own time/sanity.