My niece's iPhone 4S had water drip onto it for an undetermined amount of time. She tried to turn it off upon discovering that it got wet. But the phone would not turn off. She says it continues to display the Apple logo, which flickers till it's almost off, then flickers back on again. She's worrying that she might lose all her class notes on Voice Memo, among a lot of other data.
What should she do? Thanks!