@CurlyQue, have you had luck finding anything for your grandmother?
Eligibility for 16+ opens here on Thursday, and I was able to make an appointment for Friday morning in the next county over! The county sites are now open to anyone who lives or works there (my office is there). The website crashed last night but I tried again on a whim this morning and one location had availability! I don’t know which mfr. it is, but I’m just glad to finally be able to sign up.