Shared accounts can delete footage

There is a way for people with shared access to delete footage on the ring camera. How can we prevent someone from doing this again? My boyfriend has a ring camera and his sister who has shared access to it has the ability to delete videos even though in setting it says she can’t. I also have shared access to this device and on setting says I can’t delete footage but I found a way to select the motion i want deleted and delete it completely even though I only have shared access. This needs to be fixed.