I tried a few different things:
- No household and no individual email address = no email address in Relief Society list
- No household and yes individual email address = no email address in Relief Society list
- Yes household and no individual email address = household email address in Relief Society list
- Yes household and yes individual email address = household email address in Relief Society list
The next thing I was going to try was to have the sister check the email address(es) on her LDS Account to see if that has anything to do with it, but I have not done that yet.