Sounds like she knows that there is something wrong w/her and she is attempting to self diagnose her problems. Not being able to sleep is a symptom of depression. When all is quiet in the world, their minds can't shut off and they are thinking about what they have done in the past and what they are doing right now to us and they do actually feel ashamed and guilty for what they are doing. They all know something is wrong, but don't want us to help them or suggest that they see a doctor. The best thing to do is to not say one word about the books. If she talks to you about it, just listen...do not whisper one word about what you have learned about MLC and depression.
It's all part of the journey for them and yes, he monster will come out to play and become nastier when something isn't going her way. The best thing to do is leave her to her situation and observe from afar. Her journey has taken off and there are going to be good days and bad.
This is a marathon, not a sprint and her crisis could last a long time. So, dig deeper for patience and keep the focus on you as much as possible.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.