What app is she using to find my iPhone?

My mom said she has like a GPS on my phone so she knows where I'm at all times. I think this is extremely creepy so I'm wondering what app she is using and if I can turn something in my settings off so she can't see me. I have the iPhone 4S and she has the iPhone 3. I I turn location services off will it keep her from knowing where I'm?

It's called Find my Phone.

You can turn it off in Settings.

There's no iPhone 3. 3G or 3GS but no 3. And yes there's a difference. And yes, turning off location settings should solve that.

As far as what app, could be Find My iPhone, Find My Friends or Google Latitude if any of those are installed.