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Not positive since I don't use AT&T but it sounds like she may have an carrier APN issue.
There are messaging apps which allow you to override the phone's APN. ChompSMS has that feature and has a free version of the app. Just find out the correct APN and set it using ChompSMS. Again, not sure that's the problem but it's easy to check and fix if it is.
I am looking into what are the correct APN settings for her ATT galaxy, and compare to what is on her phone. I will also look into ChompSMS. Thanks