Hmmm, no hot dryer, just the sun.
Interestingly enough, she was dry before her last feed and afterwards the HH was wet again, but only on the side which was closest to the floor (IYKWIM?) so maybe when I tilt her on her side to feed, the booster isn't quite reaching that area and hence the subsequent leaking. Hmmmm again.
Will try extra boosting with bamboo.