Sounds like a bill collector..She probably can't tell you why she's calling. It's for consumer protection..Check out the FDCPA. Your mom should call her back.
I just got the call from Christa at that number too. I answered the phone but she asked for my mother and when I asked her what it was in regards to, she said, "oh she knows". I asked my mom about the message and she said she has NO IDEA what it's about. I googled the name of the company which is Centry and it's some sort of Title and Escrow place.
No one in this house has any idea what this woman Christa is talking about. She needs to stop calling my house before I sue her for harassment. My mother just had a stroke and doesn't need this mess.