Hello Friend, Good that you are seeking a help here. Any relationship break up will take hard time to accept the failure and adjust with reality. She may be undergoing this transition phase and distrubed emotional. More and more she tries to forget the past, the memories will keep increasing and cause her emotions trouble. She may need a counseling support to first ventilate her feelings and emotions. Later she can undergo certain self therapies or mindset changes techniques to overcome this problem.

What she is experiencing is completely normal. Talk to her. Take her out for a change. In a situation like this she needs therapy sessions with a clinical psychologist.

She may be going through a heart break and the reaction differs from person to person I believe you should take her to a psychologist for therapy She will benefit from that All the best

Support her In seeking a professional help. Fix an appointment with a psychological counselor either online or offline for her.

Assess her by a competent psychiatrist for depression m personality problem