Siri doesn't read back my text message that I want to send, all she says is "ready to send" how to fix.

Hi there mdhair2,

We're happy to provide some guidance. You'll want to start by checking some settings associated with Siri to see if that resolves the issue for you.

First, go to Settings > Siri & Search > Automatically Send Messages, and make sure that feature is turned off.

Next, go to Settings > Siri & Search > Siri Responses, and ensure 'Prefer Spoken Responses' is selected there.

You'll find more information about adjusting your Siri settings here: Change Siri settings on iPhone - Apple Support

Take care!