O.K. so while we were at the car dealer, we had to get all the car insurance crap sorted out while finalizing things. Bad news is obviously, a slightly higher cost but good news is full coverage.
Getting pissed with the insurance company e-mailing her about the changes, she's gone ahead and made changes to that. So now I have to contact the dealer and get that updated with the policy changes, and she has effectively increased the projected insurance bill in the process.
As far as I'm concerned, she just forfeited an equivalent share of her share of my regular pay cheque, or owes me monthly!