Tell her your not going to work if you don't get enough sleep and she will need to work more to make up for said missed money/work hours.
OR
Borrow someone elses kid for a couple of weeks or whatever. Then, make her take care of it..... EVEN when her friends want to go out on the weekend---SHE stays home.
OR
Buy her an egg. Put it in a basket. Tell her to not lose or break it for a whole month. Even if it doesn't work, it will be funny as hell watching her carry an egg around.