Hello daisywc27,
Welcome to Apple Support Communities!
If we understand your post correctly, the microphone on your daughter's iPhone isn't working with the Camera app and also Siri isn't working either. We're here to help!
Let's work on the microphone issue first. Try the steps below for help with the microphone.
Clear the microphones
Remove any screen protectors, films, or cases from your iPhone.
Clear any debris from the openings of your iPhone.
If you still sound unclear during calls, recordings, or apps, contact Apple Support to discuss service options.
Go to Settings > Privacy > Microphone.
Make sure that the app is enabled.
If the app has permission to access your microphone, or if it isn't listed, contact the app developer.
The previous steps came from the If the microphones on your iPhone aren't working page. If none of that helps, please provide some additional details on the context of the microphone not working. For example, does it not record any sound at all when creating videos in the Camera app, or is the created sound muffled or lower than expected? The more details you can provide, the better equipped members of the community will be to assist.
Let's address the Siri issue as well. The article below will provide steps on how to fix Siri when it isn't working as expected, so be sure to try out all of those:
If "Hey Siri" isn't working on your iPhone
"Check if "Hey Siri" is turned on
- Go to Settings.
- Tap Siri & Search.
- From here, make sure the following settings are turned on:
- Listen for "Hey Siri"
- Allow Siri When Locked
Set up Siri to recognize your voice
- Go to Settings.
- Tap Siri & Search.
- Turn off Listen for "Hey Siri," then turn it back on.
- When the Set Up "Hey Siri" screen appears, tap Continue.
- Say each command that you see on your screen.
- Tap Done.
If Siri stops responding
- Go to Settings.
- Tap Siri & Search.
- Tap Siri Responses.
- Tap Prefer Spoken Responses to hear Siri speak responses, even when Silent mode is turned on".
Thank you for using Apple Support Communities.
Take care!