Small, random questions about RotE that still bother you (spoilers all RotE books)

[fool-ish]

'When Althea kept her own features perfectly still, the woman's smile faded to a look of disdain. That expression did not change as she set a slender-fingered hand to her flat belly. As if those gloved fingers had touched her own midsection, Althea felt a chill dread spread throughout her.'

I've read these lines thrice now and still trying to decide quite what's happening here. I can only surmise it's something to do with Amber's 'skilled' hand but can't think why it would affect Althea unless she has some 'skill' ability herself? Am I missing something or will all become clear? This is only my second read of SoM so I'm allowed a confussed moment or two I think...that's my excuse anyway