Yes. The game log declares if the "first player to complete a plan" has asked for reshuffling of the deck.
The assumption, of course, is that if the game log does NOT say that...they did NOT ask for a reshuffling.
So when you see a player complete the first plan, immediately check the game log.
Additionally, the UI shows the remaining cards in each deck. Since any reshuffling MAY only take place after the first plan is completed, this will usually be about 9 - 13 cards into the deck. IF you see that number reset to 26, then that player HAS reshuffled...if the number is around 10 - 15, there was NO reshuffle.
OF COURSE, the deck is ALWAYS reshuffled after all 78 pairs of cards have been "dealt"...unless the plan situation and somebody's play are nearly perfect. I've yet to see it happen....but I'm guessing it does...