You can probably find her criminal record online, if you know the county where she was arrested.
I just looked and they charge fees. grrr It's a major city in CA.
Suppose somehow she manages to rent a car, but you think she's cheating somehow. Then what would you do - rat her out to Avis, or discuss it with her, or let it go?
Let it go, my DH and I did not plan for the boys to be with us for another week. Selfishly need time b/c we have boys 90% of time and a few weeks of summer is only break we get. Also boys will be majorly disappointed. It's typical BPD mom planning with no back up plan except leaving boys with us -- a week early.
It's maddening though now I think she should be able to find some place that will rent based on my limited research on the net.
Oh, should add, we are not worried about her driving esp long distance. If DH felt kids were in danger we'd take action.