Random email in find my iphone location

I was updating my phone and cleaning it out and I noticed a random email address in the section of Find My iPhone in the area where it is people who can see my location. I am a bit freaked out because I searched the name and apparently a google search brought back that the email possibly belongs to a 66 year old woman who lives in my state but I have no ties to. I facebook messaged her to inquire but i am freaked out because I did not allow this and never approved it- how did it happen?