Why is my iMessage not working?

I updated my iphone to ios7 and then i got my mom to also update her phone. We both use the same itunes account. Now, when i go to text her it send back to me from my number. Is this because of icloud? Or something else? And how do i fix it?

As Imessage goes over the internet and nothing has changed there check that Imessage is turned on under settings and messages

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