My mother can no longer do the stuff she used to on her iOS phone because it is so complicated compared to the iPhone 4 I gave her a long time ago.

I screen her emails with her consent, very easy to do with Fastmail that imports her Yahoo mail into a folder she doesn't see and then I move okay emails to her inbox.

Have you tried Assistive Access mode? https://support.apple.com/en-au/guide/assistive-access-iphon...