IMessage won't send to iPhone?

I have an ipod and when I text my other friends with iPhones it works. But with one of my friends iPhones… It doesn't let me send the message? And I'm certain she has an iphone because is see her everyday

She has imessage off. On your friends phone go to Settings>Messages>iMessage>ON

Make sure you and your friends' iMessages are on. Sometimes, your iPhone's messages are off by default with some unknown reasons.
Go to Settings>Messages>iMessage to check whether this is toggled to ON.

If you lost text messages or iMessages on iPhone, iPhone text messages recovery can help you recover deleted or lost SMS from iPhone, iPad, iPod Touch.

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