Pratyusha was weak in mind... she took her own life... for whatever reasons. She is responsible for taking her own life. Don't make others responsible.
Quote Sangram Singh - "She would get upset one minute and sulk. The next minute, she would be happy and normal. She did not have a suicidal streak".
Quite a contradiction in his description. If her mood swung from one extreme to another in minutes, ala Dr.Jekyll and Mr.Hyde, then she can't be described as normal.