Instagram help ASAP pleaseee?

[Taylor]

two months ago i made a new Instagram account because I didnt want anyone at all from my old town following me.. I don't have my name on my account at the top and my real name isn't in my username either. and to be extra sure no one would see my new account i deleted my facebook so it couldn't link them to my profile.... but today i got a notification saying a girl from back home is now following me.. does anyone have any possible idea of how this girl would have found my new account????? I don't see how, my facebook is deactivated with an OLD email and my real name isn't on my account anywhere, my full name is in my new email that I log in with and that's it. I've never given anyone my new email adress. and she couldnt have found me from her contacts because about 4 weeks ago my cell phone number was changed. so someone please help me understand what is up with this?!