New question re: transferring schools

[HDL66]

My daughter will be transferring to a different university to enter a rigorous professional degree program. She has been very involved in her sorority and it has taken a good deal of time. Although she loves it, she is deciding not to pursue affiliation at the new school because she is concerned she will not have enough time to devote to the house as an active.

This is my question: has anyone transferred schools and had any kind of meaningful relationship with their sorority at the new school without affiliating? If so, how did it come about and what did it consist of? Or, is it pretty much "all or nothing?"

On a related note, if you saw someone (collegiate age) on your campus wearing your letters and they weren't a member of your local organization, would you approach them and want to get to know them? Just curious.

Thanks!