What Is Used Com.samsung.android.incallui. Whether it's embarrassing pictures and videos on your smartphone, or files you just don't want anyone reading, there are plenty of ways to hide them. So i tried the following :
Just don’t delete it because if you do, then your smartphone will have to create it again on its own or search for it online(which slows everything down). Incallui is the user interface (ui) you see on the screen when the phone is in a voice call. So if you see, com.samsung.android.incallui, it means the app contains user interface (ui) data for the call screen app that provides interactive buttons for disconnecting the call, recording the call, holding the call, etc.
You should be using samsung phone with samsung touchwiz ui on top of android.
Here com.samsung.android.incallui provides interface between your dialer and machine. So i would think it means that she has made some phone calls. Open the google app on their phone. Incallui is the application that shows the ui when you get a call.