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I suggest keeping some sage around to do a cleansing or to burn it when this happens (be careful you don't want to burn your house down) that should take care of it. If possible I'd like to know more about this so i ask you send a pm to me if not then, fine. Try not to panic and also try to see if there is a alternative reason for this perhaps something like the noise she heard may have been caused by wind blowing or rather there maybe somethings wrong with the pipes inside the walls or perhaps it could be psychological.
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you sure she is not hitting herself? bruises are caused by physical things. does she already have belief in the supernatural? maybe she is hearing something else, maybe a wind or something and she is interpreting it as a whisper based on her belief in supernatural things. i don't think this is anything supernatural, she might be suffering from paranoia.
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put holy water around your house, it gets rid of bad spirits
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Probably a combination of things, but the very last - or least plausible, is a supernatural explanation. You need to start with your family doctor.
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get her see a doctor and pray for her.