Why would cheerful Disha Salian commit suicide?

A video has been released in which she is seen partying. It is claimed that it is her last video. A PIL has been filed in Supreme Court seeking direction for a CBI probe into the death of Disha Salian, along with that of Sushant, claiming "both are inter-linked". Malad's Malvani Police Station issued a press note seeking more information on Disha Salian.