At 18, she can tell you to f off and move out. I'd keep the rules minimal.
When my daughters were 18, I locked and chained the doors at 11 on weekdays. No curfew, no rules, but if you weren't home by 11 it was going to be a big hairy deal getting in.
My 2 daughters couldn't be more different. They are sisters and generally get along; but they will never be friends. Nothing you do is going to influence that.
You're certainly entitled to negotiate rent and chores; after that, her money is none of your business. Most of us need to make a few crappy financial decisions until we figure out budgeting. Better she make her mistakes sooner, than later when the stakes are higher.
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