I know it's not funny, but her behavior is almost laughably predictable.

Just an aside, make sure you document every attempt you make to gift the car and do your part. You know when you go to court next she will try to make it seem like you held her up on this process. I know you know this, make sure you get your "receipts" aka proof. Even just following up with an email to her and copying her attorney and your attorney that you went to the DMV and she had not left any paperwork to sign, so it shows you were perfectly willing to do the steps but she did not do hers.

Or if there is some other way to prove you were there (heck, I'd ask the DMV worker if I could make a short video with them saying the date and that you showed up and nothing was there - not everyone likes being filmed, but usually people understand these things).