Iphone to iphone text problem?

My sis and I both have iphone 4s but with different carriers. We have always texted with imessage without problems. Today I texted her and it went as a green bubble but did not say sent as text. I know blue bubble is imessage and green is standard text, but whenever I have sent message that was standard and green I get a message that tells me it was sent as text. How do I know if it was delivered? Could she have blocked me? Or phone broken?

Its fine, Apple does this to your Iphone or anyones iphone because it resets imessage, this should not last. Try turning imessage off than back on. If that does not work give it some time

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