There is no way to get anyones location.
Because there are two big things happen for context switching in mobile networking in your GSM SIM
HLR(Home Location Register) Address
VLR(Visitor Location Register) Address
All sites gives us only HLR Address and VLR address can be accessed by mobile companies and Police when you lost your mobile.
For more information about mobile computing
- Why HLR
- Why VLR
- And Context Switching
You can read Mobile Computing.
But you can create an application by which you can get the location of a mobile using geolocation for that you will access GPS. But in this case your mobile should have internet connection.
My opinion is that you should create an mobile application and install that in your mom's phone then track her
best example is WhatsApp Location Share.