How do you recover deleted text messages in iOS 6?
My mom has an iPhone 4S, and it is still running iOS 6 (she was afraid to upgrade when it came out, and she doesn't really know how to use iTunes so she needs me to do it for her but we haven't had the chance to sit down and back up her phone and update it yet). A few days ago, she accidentally cleared all the messages in her conversation with my brother. She likes to keep old messages either for reference, or just to reread for fun. She's really upset that they were deleted.
Unfortunately, my mom has never backed up her phone, or if she did it was a long time ago. We have read that the texts are still in the phone somewhere, we just need some kind of software to get it out. I have seen some programs online claiming to do that, but I am worried they won't work or will steal information. Does anyone on here know the best way to retrieve deleted text messages in iOS 6?
MacBook Pro, OS X Mavericks (10.9.2)