Simple answer is yes it can be done. Just set the homepage on the browser to your website and add the browser shortcut to the desktop. Along with the browser set up you will need internet connection. Most tablets do not have ethernet ports so wifi will have to be available at her location. Another option would be a tablet through a cellular provider with a data plan if there is available connectivity at her location.
Most tablets would meet that need. Another factor to consider is screen size and resolution for reading.
Mike