iphone 4 overheating without doing anything

iPhone 4 overheating without doing anything
location: macrumors.com - date: October 12, 2011
I have an iPhone 4 since launch day and it never gets hot, maybe while playing infinity blade for half an hour, but even though it is not that hot, warm, maybe. I never got any trouble with it and I am totally satisfied. Now my sister got her iPhone 4 couple of months ago and it suddenly started getting very very hot, you have no idea. Her iPhone gets hot while in standby and it gets insanely hot when you start using it for safari or messages. Last night it overheated while she was talking to her friend. I did a clear install of iOS 5 and man, it is still hot like hell. Tell me, is there anything I can do to help her?
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