Poorna was supposed to be one of the heroines in the upcoming movie RUM (Ramba, Urvasi, Menaka) also featuring Trisha. But, now we hear that she has been shown the door and has been replaced.
Poorna has reportedly said that there were some changes made to her character and story, which didn't go down well with her. There is also a 4th heroine in this movie now.

Producer M.S.Raju is apparently making a lot of changes to the story of the film post Poorna's eviction. Isha Chawla has been roped in to replace Poorna while Charmi has also joined this all girls gang as the 4th member.