Do you mean ahe ia becoming suspicious and Hyper vigilant? Do not delay but first visit a psychologist get her testing done to rule out psychosis and other underlying facts and then plan medication she will need psychotherapy too. Psychometric testing will rule out the severity of the problem. Detailed history is must for me.
Next Steps
visit psychologist asap.
Health Tips
observe and make a note before visiting psychologist which will help in treating her. Be gentle and do not fight n argument with her. which may worsen situation. her vigilance also may be due to her inadequacy and insecurity with self and others. Do not delay.