I didn't get anything from Pema and I completed all opal events and all Asami events
Viewing post in Book 5 Untold v1.0 [Completed] (Free) comments
Did Pema appeared in the game so far? If yes, then she gave you the letters. The letters will be in "Your Items" in airtemple menu. read both of them. sleep; you will have a dream. next day click the watch icon on the map screen. it will trigger the group conversation.
Also go to Heal house and heal Kuvira.