I'll add that, unlike her mother's psychotic episode, there is no paranoia here. However, when the doctor suggested that she was experiencing delusions, she didn't vehemently deny that but certainly wasn't as convinced as he was (or I am).

Apparently, stimulants can trigger psychosis in those who are predisposed. I'm so worried for her. She absolutely hates shrinks and it will be very hard to convince her to get any kind of treatment for this.

As you can imagine, this is creating a massive amount of stress in our relationship. It's difficult for us to talk about it without me becoming anxious (some of which has resolved since she has now at least seen her shrink). She did indicate that she'd be willing to go to couples counseling with me, which may help a bit with our interaction.

The main question is how to treat this without medication or counseling. Interestingly, during her mother's second episode, my girlfriend moved home and, over the course of a year, used logical arguments with her mother to demonstrate to her that what she was experiencing were delusions. The psychosis lifted--although it's not completely clear whether it was because of what my girlfriend did or whether the condition had just run its course.

What are the chances that this sort of thing will just resolve on its own in the short-term (few more weeks)? How can I help her? She may be amenable to logical arguments, since she has a scientific orientation. When she is given logical arguments that what she is experiencing is not real, she'll sometimes get a little defensive or sometimes say that she understands my perspective, but doesn't have an answer for what's going on. She recognizes that what she is experiencing is uncommon and weird. She is looking for explanations.