to the OP: heck, in a year or 2 the 18yr old will be outta there anyway right?
And in the meantime, she's under your roof, so she obeys the rules. right?
I know how it goes... but if the rules get broken, there must be consequences, Christmas or no. imho.
i envy your near-term future. should be very cool. Enjoy it.
whatever will you do with all your free time??