FLY BY WIRE .
if the temp was actually that cold u're teath were chattering then i'm sure they must have been somthing up with u. the cabin crew are only human and if it was that cold they would have been the first to get the heating on, for themselves if not the pax . u say she didn't contact the flight deck at all , u know this because u were sat at the front. its not only the in charge cabin crew as u put it who can speak to the flight deck, an as most airlines have the rule to check on flight crew every 20 minutes i'm sure they we're having a rite old chin wag down the bag most of the flight , out of sight to u !