[AlwaysSAI]

Being "released" most often refers to recruitment. If a young woman is released from a chapter during recruitment, that chapter has decided not to offer her membership.

If you were initiated into an NPC sorority, the chapter offered you membership and you accepted. You then went through a process culminating in initiation into that sorority. If you were initiated into an NPC sorority, you are not permitted to join another one under any circumstances.

You are, however, free to join a service sorority/fraternity, special interest sorority, professional sorority, etc. But, not one in the NPC.