Woke up and saw at 8:27 am that this number had called my phone while I was away from it at 6:15 am.
Knowing it would not make sense to be a telemarketer, I called Jersey Shore's main number, (732) 775-5500 (Neptune, NJ) and sure enough, my Mother In Law was admitted to the ED. I am thinking it was a hospital staff member alerting us that she was there but had left no message as per HIPAA.