Apple music
I have a family account now, we are total of 7, so one is left out, how do I add a separate account for her and off course pay for a single account?
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The person who is "left out" will have to get her own individual subscription and pay for it:
Join Apple Music on your iPhone, iPad, iPod touch, Mac, or PC - Apple Support
Perhaps one of the family members can qualify for a student discount:
Get an Apple Music student subscription - Apple Support