your maid is out of control in her personal calls.... i will not accept my maid talk her personal calls when working unless have permission...I think you better give her a warning letter...
Just like my ex-boss maids. They are crazy. They used the mobile phone for more than 3000 minutes each month. Can you terminate the mobile phone now and install back the home phone with the PIN function. So her friends can't call her and you have to warn her not to make any phone calls as this phone is purely for you to communicate with her. If she used your phone to make any personal calls, give her warning letter.