Former Sisters Forming a New Group

[azdtaxi]

So we had a couple of sisters for different reasons drop out of our chapter. Now a year later, they are starting a chapter of a latina sorority. They were intiated members of our chapter. Our greek advisor is suporting them in this new effort even though she knows they were former members of our group. I know there is no rule on this because the new group they are trying to form is not panhellenic but it just seems shady. What do ya'll think?