How do I turn on assistance reading for what is found by Siri on iPhone 12?

Hi, and welcome to this Apple (user-to-user) Community!

Re: "How do I turn on assistance reading what is found by Siri, instead of her saying, “Here’s what I found”?

my mom is blind and depends on Siri, but obviously if the answer is show on the screen, that’s not useful."

Am no expert in this area, yet your request deserves some response.

How wonderful that your mom has you, and your kind and thoughtful help!

For the simplest method of having text read aloud: See Apple support's video below:

https://www.youtube.com/watch?v=tBfcPu61nSI

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For information on Apple's accessibility features for visually-impaired or blind people"

Accessibility features for vision on iPhone - Apple Support

For guidance from someone actually working with people using the software:

There is a third-party (non-Apple) article online that describes the options for screen-reading for visually impaired and blind people. The article explains how a sighted person can set up, and turn on the features for a blind person to use. See the: guide to the main voice control and screen reading options for iPhone

Links in the article provide access to more of Apple Support's relevant videos.

For more support, or help with an accessibility feature:

You may want to contact Apple's Accessibility Support Team:

How to contact Apple for accessibility support - Apple Support

or visit

Apple's Accessibility Support Website

(NB: You can "Get Support" (online chat / phone / email etc.) from the link at the bottom of their website:)

Accessibility Support - Official Apple Support

All the best :-)