Strange chinese menu on Lenovo IdeaTab S6000
What can I do to determine the cause?


The user just accidentally accessed the Factory Mode on Lenovo tablet.

It can be accessed by:


Turn off the device
Hold "Volume Down", then connect the USB




(Image courtesy of XDA)

As a proof, there is a text containing "GPS" like you mentioned.

For the translation of each menu, you can refer to the post on XDA forum (also, source of this information).


  Should I contact the provider/manufacturer?


If the user didn't do anything on this menu, then I believe you don't need to contact the provider/manufacturer since nothing happens.


  Is it safe to assume that her data &amp; accounts are not compromised?


I believe no data are compromised. Factory Mode is usually related to device testing/configuration, but not individual user data.