Not really a “fan”, but she literally changed a huge industry. She changed the way licensing is done for her catalog. She changed the way concert tickets are sold. She redefined the “concert movie”. And she did most of it in a customer focused way that most companies have wandered away from over the past couple of decades.
Once you examine what she had accomplished, her impact on the pop culture has been significant.
Except that "pop culture" has become so dispersed as to neither be "popular" nor "culture".