How to go back to IMessage from SMS?

My mom and I both have IPhones and one time I was trying to send her a text but it wouldn't go through as IMessage, so I clicked to send it as a regular SMS message, and now it only sends them to her as SMS messages. How do I get it to go back to IMessage?

Just turn on imessage in your settings, needs to be on in both phones, then its automatic

Hold down the text and it will say send as text message

Go to settings then messages then iMessage at the very top

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