I think that it is important that when the pnm is talking with a chapter member, esp one from a different GLO, that she/he mention that she/he is a legacy but wants to keep her options open. That way, if the application has that she is a legacy and/or the GLO member is still on campus, other groups wouldn't automatically assume she wants to be a WQE either.
On a related note, pnms should definitely remember to not say, before or during recruitment, that "I want QWE" because that is also considered tacky because QWE may not feel the same way.. As many posts on GC have stated, "I wanted QWE but I LOVE TRE".