How to get iOS 6 for a regular iPhone 4?

My mom got a new iPhone 5 but she had a IPhone 4 not 4s. I'm trying to trade it for a pair of beats my dr. Dre. My mom needs to have a few stuff saved to icloud, like pictures. But is there another way to get icloud for iPhone 4 with out iOS 6 because whenever I go to settings>general> there's no software update. How do I do this?

You can try just moving the files onto the computer, then transferring them to an iOS 6 device, then to the cloud.