She brings home the bacon...and beach houses, etc..
I see your point.
Exactly.
Even out in the real world, once a child is 18, parents have very little official recourse. The “stick” most parents have is that their child wants to continue living at home rent-free. When your child says, “But I’m an adult,” you can respond, “Fine. You’re an adult. Turn in your house key and walk out the door. Write when you find work.”