How to not send iMessages to a specific contact?

My mom recently switched her iPhone for a galaxys4. I have an iPhone and the first few times I tried to text her they weren't going through because they were sent as iMessages. When I realized this I tapped the bubble so it would be sent as a text. This doesn't work all the time though, and all my messages are automatically sent as iMessages to her first. How can I fix this?

Turn off imessage… Reboot phone… Turn on imessage… Work now?

if not, factory restoral on itunes… Work now?

if not, call Apple

Very simple actually. Imessages rely on Wi-Fi. Simply turn off your Wi-Fi and it should send as a normal text message. Or if you want to disable imessage all together. Then go into setting, look for messages(it shows with the Text Message Icon) and look for imessage options. If you can't find it there, try general settings.

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