What is she referring to?
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It seems to be a reference to some bit of folklore, but my google-fu isn't up to the task of finding out. Does anyone know?
"Angel passing" and the allusion to 20 is somewhat common for an awkward silence during a conversation. See http://www.snopes.com/oldwives/silence.asp for example
The crossed feet is probably similar to crossed fingers - as they are not crossed, so it is a bad thing.