IPhone water damage, won't charge?

Hi
so my mum dropped her phone down the toilet, she pulled it out straight away and dried it with a towel but it still worked perfectly fine but she did have it in and out of rice for about an hour, her phone now will not charge and just keeps flashing the charging symbol, we have it in rice now anyone have any ideas if it will still work?

The phones battery may have been damaged and can't charge or the charging port is water damaged

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