for my mother i installed /e/OS myself, but if she had to get a new phone while i am not around i'd point here to that website and tell her to get one of those.
/e/OS is currently 7 months behind security updates for the browser/webview for the second time in a row and has a PDF viewer not updated since 2016 yet considers itself the "state of the art" in security. See my full list of issues with it here: https://divestos.org/misc/e.txt
for my mother i installed /e/OS myself, but if she had to get a new phone while i am not around i'd point here to that website and tell her to get one of those.
/e/OS is free of bloat, yet easy to use.