A gajillion trips up and down the stairs = "Screw it, I'll just stay in the basement for a while"
"Screw it, I'll just stay in the basement for a while" = a dramatic decrease in the amount of clutter in the basement + a dramatic increase in the amount of recycling ready to be taken to the recycling center
A mountain of laundry needing to be done = a need to fold some of the laundry to free up enough baskets to bring the newly-cleaned laundry up the stairs
A previously-scheduled engagement = a fair amount of walking around outside
Solve for how tired Amanda is.
Answer listed in the teacher's edition: "Utterly exhausted."