Enabling.
Doing for others what they can and should do for themself.
Waffling on boundaries.
Controling.
Caring about another is not co-dependant.
You say her car...in her name?
If you were to take the plates and stop the insurance if it is in your name...
What drives a person to do such would say if they are co-dependant.
If taking the plates and insurance to protect self from anothers poor choices...that would be a boundary. If doing so trying to manipulate and outcome...that could be seen as co-dependant.