IPhone keeps trying to send an iMessage?

I have an iPhone and I'm trying to send a text to someone who previously had an iPhone but no longer does. If I turn iMessage off, I can't talk to some of my other contacts. So I do not have a SIM card, she doesn't have access to an iPhone, and I can't hit "send as text message" because my iPhone sends the message too fast.

I believe the iPhone should automatically switch to regular text messaging if the other person doesn't have an iPhone, and if you turn off iMessage, that shouldn't stop you from texting your other iPhone friends.
Hope this helps

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