Jessie may know but she is the most loyal person to Aria and Aria loves her maybe more than he loves her mother
she*
Im guessing its because they are supposedly much younger than they look.
But at this point Jessie is still the sis' minion
Jessie was always on Aria's side, Annie is Mielle's minion hehe
When she light up the fire/candles, won't the maid suspect anything????