When you're 6 it might work, but when you're 10 you just learn to ignore whatever she says cause she's clearly telling you bullshit.
I especially remember grandma telling us not to play on a heap of wood planks (probably because you could fall into a hole and break a leg or sth). Her reason was - a "kuna" (weasel-like animal, pretty harmless for people) lives there and will bite us.
There was no internet yet, and we had no books on kuna, so we imagined it like a huge monster:) Later I learnt what's a kuna and laughed it off, but my younger sister refused to go to my grandma house (like 100m from our house) alone because of the wood planks heap and kuna nearby. For like 4 years :) Despite my parents telling her what's kuna and showing her photos and everything :) My parents were pretty angry with grandma because of that :)
I admit I was a dick about that and told my sister additional stories about kuna as well.