Is this message mistake possible?

I recently received a message from my girlfriend saying "If you want." I asked her "If I want what?"and she claimed that she never sent anything like that. I sent her a screenshot of my android message box with the message on it and she replied with a screenshot of her iphone with no message. She claimed it wasn't even a mistake, that she didn't send it at all. I don't question her truthfulness, but I definitely got this message under her number. Is it possible for it to be a mistake? Is it even possible for a random message to make it to my phone under her number? Could anything have gone wrong, or is the only possibility that she sent it from her phone and is denying it? And cell phone gurus with answers?

I received message from someone in error. They didn't deny it and it ended the relationship becasue the message was for another guy and it was very intimate.

I got over it.

Someone could have used caller ID spoofing to make it appear that the call came from her number.

I receive messages meant for my friend after she sends a message and many people text her back a response all at once. Something like this could have happened.

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