Vidac's sister lost her Samsung Galaxy Tablet. How can she find it? Leo says that she can go to Google.com/dashboard and she may be able to see where it is under location information. She could also look at her Google Maps timeline if she has it and it's on (it is by default). She can at least narrow it down. Google also has a Find My Device page... Google.com/android/find
There's also an app on Google Play called Find My Device which will tell her where her Samsung device is.