I’m extremely sceptical whether she’s a spy or not.
I actually think it’s pretty unlikely. Ask yourself how likely it is that she’d been allowed to reveal that in open court if she was.
Far more likely that she’s happy to use any tactic available to avoid a trial. If she’d done the decent thing...and stayed for trial...she would most likely have received a suspended sentence, a heavy fine, and a driving ban. (Assuming it was a tragic accident and she wasn’t drunk or on drugs.)
And certainly don’t see any relevance in civil case for damages whether she’s a spy or not...though I suppose in remote chance that her duties necessitated a high speed car chase..perhaps US government would stump up costs awarded?