Will resetting my old iPhone delete anything from my new one?, Will resetting my old iPhone delete anything from my new one?

Basically my mum got a new iPhone 5s as an upgrade to her iPhone 4s and she tells me that when she deletes things on her old one it deletes things on her new one. I can't iMessage her without it telling me that it is my step dad as he had the old one for about 3days. I have turned iMessage off on the old one but it is still happening.
I thought the best option would be to delete everything from the old one and reset it to factory settings. However she is hesitant as she thinks everything will be deleted from the new one and the iCloud.
I need to check the iMessage is turned on on the new one but she won't let me near it at the minute.
And suggestions would be great

There is nothing to delete.
Plug the new iPhone in and sync.

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