I've joined many alumnae associations since graduation due to PCS moves. Some ass'ns were made up primarily of local chapter graduates (ie Louisville was all UK and IU alums with a smattering of others). Other associations (Boston, Northern VA) have alums from all over the country. All have been welcoming and inclusive.
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....but some are more equal than others.
Our Alumnae Chapter have several members who were in chapters that closed either right after they graduated or while they were still in school. No one cares that their chapters were not as strong as others. Remember, a chapter that is super strong today can fall on bad times and become a struggling chapter within a short time. We are all sisters, that is all that matters. We share our sisterhood, and work together.