It was kind of wrong to scare the cat, but I suppose the main thing is that it was unharmed. There's a woman who lives by me, and she actually drives at cats (she's nearly run my cats over a few times), so I guess it was lucky the cat was OK, seeing as there are some people who wouldn't stop.
If you do have any concerns regarding this woman, if she does break into your house (which is probably highly unlikely), let the police know. But personally I wouldn't take any notice of what she said. She certainly does sound crazy to me.
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Many moons ago, a little rubber ducky took to the waters and washed up here.