if you feel unsafe for any reason, see if you can take a friend with you to wait outside... leave your cell phone on and give yourself half an hour before your friend rings, if all is going well just say you are in an interview and will call back, if not going so well have a safe word before going in and use that when your friend calls.
with the way things are today, emails are so fast and to the point saving time and money, so her sending you an email rather than calling on the phone might be the way they work
good luck