can I discipline my 20 year old daughter if i support her?

by SS&SS
Question by kitty: can I discipline my 20 year old daughter if i support her?
My 20 year old daughter lives at home, drives my car, and uses my credit card, and goes to college on my dime, but when it comes to me having any control over her she says "you can't do anything I'm an adult now, I'm not a kid." But sometimes she acts very much like a 12 year old and not 20. She has begun using the credit card I gave her to buy gas (so she can commute to school, it's much cheaper) to buy

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