a point of note --- if she's not sleeping through the night when she's taking SQL. it might be that she could be entering a hypomanic/mixed episode. recent data suggest that quetiapine has a mood stabilizing effect as well as bipolar depression (for which they have an sNDA pending with the FDA).
what's the rationale behind stopping the medication?
as always -- she should consult with her physician.
I am sorry about your friends diagnosis of Schizophrenia. I am sure that it is difficult for you and most especially for her to adjust to. I kind of sounds like your friends doctor is recently adjusting her medication dosages and perhaps the Seroquel has not had the time to reach it Therapeutic Level in her body just yet. In some people it can take weeks for this to occur. So everytime the doc does a med adjustment then it is going to mess with the level and take time to balance out. Then you also have to figure that she is most likely on other medications on top of this. Your friend really should have positive support and encouragement from family and friends to continue to take her medications and communicate any problems with her doctors. This is what is best for her treatment and her illness. I do realize that it is hard for you to see her go through what she is and that you care about her a lot. However, Schizophrenia is a terrible disease to have and psychiatrists do not make this diagnosis lightly. Take care....