Android is far ahead… as long as you only use AOSP or Lineage, avoid Google Apps and install apps from F-Droid and not from the Play Store.
I know these are a novelty on Android where most people use Chrome because it's pre-installed - but add-ons are small, self-contained downloadable additions to your browser. There are multiple such add-ons that will block ads for you. They also work in-app where the Firefox WebView/custom tab is used.
I still don't understand which law allows _not_ to show a choose your default browser installer, like Windows had to after the court decision.
This is old tech, and it works very well, on any variant of android. Apple is the one that's very behind.
Then ot doesn't matter. If she trusts Google, there's nothing to do.