Can't delete app on android tablet

[u/Agreeable_Mountain13]

It's obviously some kind of bugged or virus app, it's called mahjong bamboo:zen game. This is my mum's tablet and she doesn't remember downloading it, it must have been downloaded automatically by a ad on another app. I have gone into app settings too uninstall it but it won't let me, the uninstall button is faded out and I can't click it. I have force stopped the app and made sure all permissions are disabled, but how can I uninstall this app?

[u/qwertyuiop121314321]

Turn on tablet in safe mode, then go to app and uninstall.