A good compromise is having the post high school girl make sure her room is clean, the area she works in is clean. To be responsible for her messes. When she uses something she puts it away, when she works in the kitchen she cleans up after herself. When she involves in a project/or does something with other family members such as eats dinner, plays a game-she cleans up heer share.
What is this need for a cleaning lady?!? She should also have to pitch in a bit on shabbos to clean up after the younger ones since that’s when she has a it of a break. Shabbos is long enough to pitch in for an hour or two and get in extra sleep in the USA