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That will be at her end. Again check Settings > Messages > Send & Receive. It may be that, for example, she only has her email address stored as being able to receive iMessages, but you're sending to her telephone number or vice versa. Or she may have iMessage off completely.

Was it a text or an iMessage? Does your mate have an iPhone? If so, go into Settings > Messages > Send & Receive It might be that you're still sending iMessages from your old number. If your mate hasn't got an iPhone and/or it wasn't an iMessage then I have no idea as I've never ported a...